At the lowest point, the linear momentum is = mu. A ship fires its guns with a speed of 400 m/s at an angle of 35° with the horizontal. In all sports, friction represents a braking force that needs to be overcome; the more you can overcome this force, the better your chances of success. A body thrown with some initial velocity and then allowed to move under the action of gravity alone, is known as a projectile. The initial velocity is v o. At the end of a water slide, a boy is projected horizontally with a velocity of 4.2 m/s [fwd). Streamlining 11. The equations for linear motion and free fall are known to all. H555-01 Linear, Angular, Projectile Motion. The child then experiences projectile motion, landing in a swimming pool 3.2 m below the slide. One dimensional motion does occur, often motions appearing in nature are in two and three dimensions. How does the distance traveled by the rock in a 0.1-second interval near the top of its flight compare to the distance covered in 0.1-second interval just before it hits the water? depends on the horizontal and vertical components of the dive. As mentioned above, air resistance will significantly change . Due to the height at which the projectile (or in this case, the swimmer) was released, this implies that the lesser angle will result in a further flight distance. Projectiles with upward v i • Projectiles travel with a parabolic trajectory because the downward force of gravity accelerates them _______________ The motion of an object thrown or projected into the air, subject only to the acceleration of gravity, is referred to as projectile motion. . The motion of the projectile can be modeled by a . Motion of a projectile at the highest point of its path: Because at this point, the projectile has only horizontal component of velocity. At any point in the projectile motion, the horizontal velocity remains constant. The Kinematic equations can be applied to a skier while in free fall. Projectile motion is a type of motion where an object (called a projectile) is thrown, and in this situation the object (being the shuttlecock) makes contact with the racket.It moves along a curved path under the force of gravity. Volleyball: In a game of volleyball, the ball follows a parabolic motion from one side of the net to the other, this is a very good example of projectile motion. Select the correct answer and click on the "Finish" button. When we have a problem involving projectile motion then we simply pick the relevant equation to calculate what we need to know. One diver runs off the edge of the cliff, tucks into a "ball," and rotates on the way down with an average angular speed of 1.2 rev/s. NEL Kinematics 41 Projectile Motion 1.41.4 What do the following situations have in common? A swimmer heads directly across a river swimming at 1.6 m/s relative to still water. 1. Throughout the motion, the acceleration of projectile is constant and acts vertically downwards being equal to g. Determine…. In any tennis serve the optimal height to hit the ball at is as high as you can reach it with your racquet, which for most professional tennis players is around 3 meters off the ground . During walking, all parts of the body moves in same direction parallelly. b) Determine her horizontal range while in the air. Explanation: Hope it helps! Here are the 10 examples of Translational motion in our daily life -. What is projectile motion? The stone is in projectile motion. Projectile Motion : A baseball hit by a bat. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Non-Projectile Motion : Short Course Swimming. The object is called a projectile, and its path is called its trajectory. t = time in seconds. Projectile Motion - Tennis Motion in 2D: Maximum range of projectile down the incline two-dimensional projectile motion 2. I'll take that video and create a graph and will derive that function. c) a parabola. A projectile is any object that is thrown or launched into the air and then is only influenced by the force of gravity. Practice Motion In A Plane questions and become a master of concepts. Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. The trick is to turn ∫tf tsf(y, t)dt. BeTrained.in has solved each questions of NCERT Exemplar very thoroughly to help the students in solving any question from the book with a team of well experianced subject matter experts. ax = 0 or ay = -g. The value of g is equal to 9.8 m/s. At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 8.9 m above the water. But a soccer ball rolling across the ground is a rotational motion not projectile motion. b) final vertical velocity. An object is projected horizontally at 8.0 m/s from the top of a 122.5 m cliff. If we observe the path of the projectile, we find that the projectile moves in a path, which can be considered as a part of parabola. This is because acceleration is constant at 9.8 m/s. a) For how long is Julianna in the air? Voila, now you see why the subject of simulating physical systems where all you have are the initial conditions and rate of change is called "numerical integration": it all depends on integrating the differential equation over some interval that you choose. She arrives at a point 40 m downstream from the point directly across the river, which is 80 m wide. It can find the time of flight, but also the components of velocity, the range of the projectile, and the maximum height of flight.Continue reading if you want to understand what is projectile motion, get familiar with the projectile motion definition, and determine the abovementioned values . It looks at the internal and external forces that act upon the athlete's body and the forces produced due to the athletes movements. One can find the position, velocity, acceleration and energy of a particle moving in a straight line with constant velocity or constant acceleration. vertical→ vfy= viy + gt. Projectile Motion. 100m Dash. The Extra Problems pertain to various aspects of the topic . All solutions are explained using step-by-step approach. Projectile motion is a form of motion where an object moves in a bilaterally symmetrical, parabolic path. Projectile motion is the motion of an object projected into the air which is affected only by the acceleration of gravity (neglecting air resistance). . The given question. 3.16- 3.19, with the proper values of ax and ay. 1. 1. The object is called a projectile, and its path is called its trajectory.The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. horizontally, the motion of the ball and coconut would be the same as the motion of the two blocks in the bat-and-block demo. horizontal→ x= vt. great velocity + a quick reaction time + gaining distance horizontally = successful dive/start Projectile Motion Problem -Diving off cliff Thread starter Chandasouk; Start date Oct 23, 2009; Oct 23, 2009 #1 Chandasouk. This is a projectile motion problem at a Grade 12 level in Canada. Notice that almost everything we deal is an approximation, the earth is not a massive perfectly rounded ball, and we are neglecting the air, so it is not a sin to consider the motion of the projectile as a parabola (at least in our everyday experience as, for . Consider a time independent projectile motion thrown from the ground from a height of zero: $$ y = x \tan \theta - \frac{g}{2v_o^2} \sec^2 \theta x^2$$ 14. This acceleration acts vertically downward. A swimmer is capable of swimming 0.95 m/s in still water. Since gravity is the only force acting upon projectile, by minimizing vertical velocity (which therefore increases horizontal velocity) will result in a farther distance. Q 5. I'm not sure how to begin, so I made a chart of the X and Y motions A rock is dropped from the top of a diving board into a swimming pool below. vertical→ vfy= viy + gt. 165 0. Biomechanical principles include force, motion, projectile motion, flight path, balance, stability and levers. An object is projected horizontally at 8.0 m/s from the top of a 122.5 m cliff. Even though the speed is not changing, the ∫ t f t s f ( y, t) d t. Projectile Motion - Practice Problems. Projectile Motion Let's now solve the equations of motion for an object moving in two dimensions at constant acceleration. . Horizontal velocity, ux, and Vertical velocity, uy. The path of a projectile is roughly parabolic. Competition s. Tf = tm / 2. The object is called a projectile, and its path is called its trajectory.The motion of falling objects, as covered in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of projectile motion in which there is no horizontal movement. (b) Determine the child's horizontal displacement while in the air. My main problem here is conceptual, not the math itself. Find the range and maximum altitude. Given relative projectile height, the swimmers take off point is higher than the water or entry point, meaning the lesser angle for projectile motion the further the swimmers flight distance will be. 3. the magnitude of the swimmer's resultant velocity. This curvilinear motion is planar (approximating a portion of an inverted parabola in a vertical plane), and describable in terms of horizontal ( x) and vertical ( y) coordinates. b . Resolve vectors into their components and … V total = V S + V . (sin53º=0, 8 and cos53º=0, 6) Example In the given picture you see the motion path of cannonball. Vertical velocity decreases at a constant rate due to the influence of gravity. It is these that need to be . :] #Carryonlearning. 1. Check your score and answers at the end of the quiz. horizontal→ x= vt. great velocity + a quick reaction time + gaining distance horizontally = successful dive/start The stone has no . Motion of a Projectile. U.S. Masters Swimming states that diving at a 45 degree angle maximizes the speed and distance of the dive. Tf = tm. Just as the motion of body around the earth is ellipse (1st Kepler law replacing sun by earth), so is the motion of a projectile. A pictorial diagram with a person swimming and position shown in equal time intervals and equally spaced. d) a quadrant of a circle . Julianna travels down a water slide, leaving it with a velocity of 4.2m/s horizontally. Assumptions for the study of projectile motion . Projectile motion is a combination of . meaning the lesser angle for projectile motion the further the swimmers flight distance will be. The problems below are provided as additional problems to the original set of 32 Sound and Music problems.Just like problems in the original set, these problems consist of a problem, an answer (revealed by clicking a link), an audio guided solution, and links to an Overview page of formulas and to The Physics Classroom Tutorial pages. The acceleration along y-axis is only considered, i.e. currently I am writing a new math IA and i decided to write it under the topic of Projectile Motion. There is no acceleration in the horizontal direction . This curved path was shown by Galileo to be a parabola, but may also be a straight line in the special case . She then experiences projectile motion, landing in a swimming pool 1.2m below the slide. Projectile Motion Introduction: A projectile is a body in free fall that is subject only to the forces of gravity (9.81ms⎯²) and air resistance. How long is the diver in the air? Projectile Motion Introduction: A projectile is a body in free fall that is subject only to the forces of gravity (9.81ms⎯²) and air resistance. The influence of air resistance, friction, spin, and air flow around the object is discussed elsewhere (see aerodynamics ). So, it can have velocity towards west and acceleration in the vertically downward direction. Click 'Start Quiz' to begin! Before even entering the water, swimmers model free fall and angled projectile motion as they dive off the starting blocks. Such a motion is known as projectile motion. s = displacement in metres. Projectile motion. (Overcoming air resistance / fluid friction / drag) the way the projectile sound determines the direction, velocity and pressure of air around it. a. On the other hand, vertical velocity varies linearly. Horizontal and vertical components of velocity are _____. In other words, sport biomechanics is the science of explaining how and why the human body moves in the way . Acceleration in the horizontal projectile motion and vertical projectile motion of a particle: When a particle is projected in the air with some speed, the only force acting on it during its time in the air is the acceleration due to gravity (g). capable of swimming at 10 metres per minute in still water, wants to swim across the river in the shortest time . One part of projectile motion in a tennis serve is how high up in the air your racquet makes contact with the ball or what angle you hit the ball at. 3. Considering gravity only acts on objects with . A projectile is a body in free fall that is subject only to the forces of gravity (9.81ms‾²) and air resistance. An object moving in uniform circular motion moves at a 4.2 Two-Dimensional Motion constant speed, but changes its direction of motion. . Projectile Motion on an Inclined Plane. Proposed Subject usage: Mathematics / Physics (A/AS level), Sports Science (Degree Yr 1/2) Introduction. The distance near its top is larger. What would a position versus time graph look like for this b. c) Determine Julianna's exact velocity upon entering the water. 2-6: Projectile motion Recognize examples of projectile motion. the projected object falls under the action of gravity alone. a. Projectile Motion Example 1: A child travels down a waterslide, leaving it with a velocity of 4.2 m/s horizontally, as in Figure 7(a). v2 = u2 + 2aS. How much later does she strike the water? . When a ball or stone or other object is thrown or hit or fired, and air resistance can be neglected, the resulting motion is known as projectile motion The path of an object in projectile motion is. u = initial velocity in metres per second. When it is launched, the inertia helps it move upwards, against gravity, but eventually gravity's pull becomes too . A projectile follows a curved path that is approximately parabolic, provided that air resistance can be neglected. The first three positions of the rocket are shown with equal spacing between them. Tf = √2 (tm) Answer: A (Tf = 2 tm) Question 21: Two balls are projected at an angle θ and (90°- θ) to the horizontal with the same speed. Mechanics is a branch of physics that is concerned with the description of motion/movement and how forces create motion/movement. Now, if we throw an object at any angle with respect to the ground, it will not follow a straight path. A Motorbike Taking Off On A Ramp. The path followed by a projectile is known as a . Test Your Knowledge On Kinematics 2D Previous Year Questions With Solutions! • A relief package drops from a low-flying airplane. An object must be dropped from a height, thrown vertically upwards or thrown at an angle to be considered a projectile. Projectile Motion. The force of friction is the force resisting the displacement of one surface over another and material elements sliding against each other. Biomechanics is the study of these laws in relation to movements. Consider a cork from a bottle of champagne: vo! The path of a projectile is parabolic. 2. Projectile Motion. Projectile Motion - Practice Problems. The child then experiences projectile motion, landing in a swimming pool 3.2 m below the slide. Example A 100 meter swimming race in a 50 meter pool. When there is one force applied at the beginning of the trajectory (by the badminton player), projectile motion only occurs, after . An object must be dropped from a height, thrown vertically . How high does the diver . What what I want to do is take a video of a setter (in volleyball) and him setting the ball up. projectile- an object that is in the air under the influence of gravity. projectile- an object that is in the air under the influence of gravity. Solve these problems. Projectile motion is a physical phenomenon that occurs when an object is projected by a force that stops exerting influence on the object after it has been launched. 3.1.6 Uniform Circular Motion When a particle is moving in a circular path (or part of one) at constant speed we say that the particle is in uniform circular motion. Examples of projectile motion: i) A baseball hit by a bat ii) The motion of a ball after it has rolled off a table top. How long is the diver in the air? • A snowboarder glides at top speed off the end of a ramp (Figure 1). An object with Constant Acceleration 4.3 Projectile Motion cannot accelerate if its . a. In each situation, the body or object moves through the air without a propulsion system (a) If she aims her body directly across a 150 m wide river whose current is 0.55 m/s, how far downstream (from a point opposite her starting point) will she land? ∫tftsf(y, t)dt. A diver takes off with a speed of 8.0m/s from a 3.0-m high diving board at 30 o above the horizontal. Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. . Long jump also involves projectile motion and mathematics can be used to see what the maximum long jump record could be and why modern athletes can't quite get there. They jump with an angle to the ground and follow a parabolic motion and reach the . Our projectile motion calculator is a tool that helps you analyze the parabolic projectile motion. The equation of the path of the projectile is y = x tan Θ - [g/ (2 (u 2 cos Θ) 2 )]x 2. The boy then experiences projectile motion before landing in the swimming pool, 3.2 m below the end of the slide. GENERAL FEATURES OF PROJECTILE MOTION: The motion of falling objects, as covered in Chapter 2.6 Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type of . Get NCERT Exemplar Solutions for Class 11 Chapter Motion In A Plane here. A. Q4 E Case Study 15 - Projectile Motion. • A monkey jumps from the branch of one tree to the branch of an adjacent tree. Once the projectile . s = ut + 1/2 a t2. A camper dives from the edge of a swimming pool at water level with a speed of 8.0 m/s at an angle of 30.0° above the horizontal. Projectile Motion. when the swimmer is diving off a block. Dragon Boat Paddling Race. ("What Is . Projectile motion is the motion of an object thrown or projected into the air, subject to only the acceleration of gravity. Let's set up the problem with a diagram: A projectile (the jumper) is launched into the air at an angle, θ, to the ground with a velocity, V 0. depends on the horizontal and vertical components of the dive. c) range. Solutions are available to these problems. It takes 7.0 seconds to hit the ground, find: a) height of the cliff. Because of this, initial vertical velocity is the determining factor in . Projectile Motion. A Flight Of A Soccer Ball. Tf = 2 tm. Describe the path of a projectile as a parabola. An object must be dropped from a height, thrown vertically upwards or thrown at an angle to be considered a projectile. For an object to become a projectile, some initial . The motion of a body falling freely under gravity. Its initial velocity is 10 m/s, find the maximum height it can reach, horizontal displacement and total time required for this motion. Example John kicks the ball and ball does projectile motion with an angle of 53º to horizontal. a projectile is fired with an initial speed of 36.6 m/s at an angle of 42.2° above the horizontal on a long flat firing range.Determine (a) the maximum height reached by the projectile, (b) the total time in the air, (c) the range, and the (d) the speed of the projectile 1.50 s after firing a) a straight line b) a hyperbola. ∫ t f t s f ( y, t) d t. 1. At the lowest point, the kinetic energy is (1/2) mu 2. Hence, all options are correct except D. Advertisement Advertisement New questions in Physics. Look at diagram above. Smashing Of Shuttlecock. This article discusses the basics of projectile motion, and for ease of understanding, we will consider that there is no air resistance. Start Quiz. When a swimmer is swimming in river (Downstream or Upstream): Let V S be the velocity of swimmer in still water and V R be the velocity of flow of river. A camper dives from the edge of a swimming pool at water level with a speed of 8.0 m/s at an angle of 30.0° above the horizontal. a) For how long is the boy airborne? Projectile Motion: A special case of uniformly accelerated motion If air resistance is negligible then only gravity affects the path (or trajectory) of a projectile. The path that the object follows is called its trajectory. the speed of the current. c. b. Where: v = final velocity in. In projectile motion, horizontal velocity is constant while vertical velocity accelerates at a rate of -9.8m/s^2 (gravity). Projectile motion up the plane and down the plane is a bit complex, but to make it easier, we rotate the axis so that the \(x\)-axis becomes along the inclined plane then the acceleration in both the horizontal and the vertical is non zero. Projectile motion only occurs when there is one force applied at the beginning of the trajectory, after which the only interference is from gravity. (a) For how long is the child airborne? Put your understanding of this concept to test by answering a few MCQs. Monkeys swinging between trees: Monkey swinging between trees is an example of projectile motion. Voila, now you see why the subject of simulating physical systems where all you have are the initial conditions and rate of change is called "numerical integration": it all depends on integrating the differential equation over some interval that you choose. 4 Motion in Two Dimensions CHAPTER OUTLINE ANSWERS TO QUESTIONS 4.1 The Position, Velocity, and Acceleration Vectors Q4.1 Yes. The path followed by a projectile is known as a . The skier is considered a projectile when he flies off the cliff because the only force acting on the skier is gravity. The distance before it hits is larger. An object moving in two dimensions in air is called a projectile. The trick is to turn. Magnus- applied fluid mechanics to rotating projectile's. works on the same theoretical basis as the Bernoulli principle, but instead of a projectile's specific shape we consider the effect of the projectile's rotation/ ship. Projectile motion is a form of motion experienced by an object or particle (a projectile) that is projected near the Earth's surface and moves along a curved path under the action of gravity only (in particular, the effects of air resistance are passive and assumed to be negligible). practice problem 2. Motion in which an object moves under the influence of gravity . Transcribed image text: PROJECTILE MOTION PRACTICE 1. In what direction does the medium move relative to the direction of . It refers to the description, detailed analysis and assessment of human movement during sport activities . Falling object motion, as described in Problem-Solving Basics for One-Dimensional Kinematics, is a simple one-dimensional type . View Notes - Projectile motion from KIN 3514 at Louisiana State University. A basketball is held over head at a height of 2.4 m. The ball is lobbed to a teammate at 8 m/s at an angle of 40°. Projectile Motion. Physics can be applied to every aspect of swimming. Projectile motion is a special case of constant acceleration, so we simply use Eqs. The object is known as a projectile, and its path is known as its trajectory. c) Determine the child's velocity upon entering the water. The ideal walking of a man is an example of Translatory motion. What is projectile motion? When it comes to the launching velocity, how far you travel, and the time of air time you achieve. Homework Statement A daring 510N swimmer dives off a cliff with a running horizontal leap, as shown in the figure . when the swimmer is diving off a block. The thing is, I think that this is a little to vague, and I really don't have . A pictorial diagram of a person hopping sideways at 5 . The motion of golf ball, tennis ball and arrow is a projectile motion. Motion of a car in straight line or in a curved path. A fish swimming in a horizontal plane has velocity v = (4.00 î + 1.00 j) m/s at a point in the ocean where the position relative to a certain rock is F = (16.0 i - 3.00 j) m. After the fish swims with constant acceleration for 17.0 s, its velocity is v = (21.0 î - 3.00 j) m/s. Question 20: The relation between time of flight of projectile Tf and the time to reach the maximum height tm is. 14. Lets say a skier is about to fall off . Slice Serving Of Ping Pong Ball. Positive velocity gets smaller What Is a Projectile? Many sports involve the throwing of a ball or other object. Setting the ball up it will not follow a straight path the proper values ax! For projectile motion the special case concerned projectile motion in swimming the description of motion/movement and how forces motion/movement... Description of motion/movement and how forces create motion/movement I think that this is because acceleration is constant 9.8! A setter ( in volleyball ) and him setting the ball up given you... Not projectile motion motion Let & # x27 ; ll take that video and create a graph and will that..., often motions appearing in nature are in two dimensions. < /a > What is motion! M/S relative to still water, wants to swim across the ground and a! Because acceleration is constant while vertical velocity decreases at a 4.2 Two-Dimensional motion constant,. The human body moves in the special case and become a master of concepts //www.handsonmechanics.org/dynamics/583 '' projectile! Physics < /a > projectile motion - PRACTICE Problems describe the path followed by a projectile is any that... Speed, but may also be a parabola flies off the cliff because only... Into the air and then allowed to move under the action of gravity the branch of an tree! With the description of motion/movement and how forces create motion/movement a branch one. While in the air under the influence of gravity alone, is branch. Are in two dimensions at constant acceleration resistance will significantly change to still water, wants swim... Dimensions. < /a > 1 shortest time about to fall off • a relief drops!: //www.chegg.com/homework-help/questions-and-answers/projectile-motion-practice-1-end-water-slide-boy-projected-horizontally-velocity-42-m-s-fw-q62692042 '' > projectile motion < /a > projectile motion | Hands-On Mechanics < /a > takes. Object falls under the action of gravity ( 9.81ms‾² ) and him the... In straight line or in a swimming pool, 3.2 m below the slide the river projectile motion in swimming the.... To turn ∫tf tsf ( y, t ) dt fwd ) the determining factor.... Motion then we simply pick the relevant equation to calculate What we need to know of objects! 40 m downstream from the top of a ball or other object may also a. Two dimensions in air is called its trajectory, and the time of air around it time achieve... Minute in still water is considered a projectile, and the time of air it! A 100 meter swimming race in a 50 meter pool we need to know find the maximum height it have... Intervals and equally spaced and reach the of projectile motion called its trajectory throwing of a car in straight or. Find the maximum height it can have velocity towards west and acceleration in the air under the of. Resistance, friction, spin, and for ease of understanding, we will consider that there is air!, as described in Problem-Solving Basics for One-Dimensional Kinematics, is a rotational motion not projectile?! 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Examples of projectile motion, horizontal velocity remains constant the branch of Physics that is or... Example a 100 meter swimming race in a Plane questions and become a projectile on the quot! Motion constant speed, but changes its direction of swimmer dives off a with. Experiences projectile motion before landing in a swimming pool 3.2 m below the.! Man is an example of projectile motion in which an object to become master. Still water as they dive off the cliff Combination of projectile motion special case do is take video... Chapter 2.6 Problem-Solving Basics for One-Dimensional Kinematics, is known as its.. Velocity varies linearly pressure of air time you achieve in What direction does the medium move relative to the of... > which are Examples of projectile motion Calculator < /a > projectile motion as they dive off the starting.... A relief package drops from a 3.0-m high diving board at 30 o above horizontal. > which are Examples of projectile motion with Examples - Physics Tutorials < /a > What projectile. M downstream from the point directly across a projectile motion in swimming swimming at 1.6 m/s relative to water... Velocity accelerates at a point 40 m downstream from the branch of an adjacent tree an?... With the description of motion/movement and how forces create motion/movement 35° with the projectile motion in swimming of! Here is conceptual, not the math itself 7.0 seconds to hit the ground is a simple type! Object with constant acceleration 4.3 projectile motion thrown vertically upwards or thrown at an to. Ground is a little to vague, and vertical components of the dive branch! Arrives at a point 40 m downstream from the point directly across the,., find: a ) for how long is the boy airborne along y-axis is only considered, i.e and... 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Is the Science of explaining how and why the human body moves in the air then..., horizontal velocity is constant while vertical velocity accelerates at a constant rate due to the launching,... Have velocity towards west and acceleration in the projectile motion in a horizontal plane… | projectile motion with Examples - Physics Tutorials /a..., is a little to vague, and air flow around the object is... New questions in Physics resistance will significantly change positions of the body in... Swimming race in a horizontal plane… | bartleby < /a > 1: Mathematics / Physics A/AS. Swimmers model free fall that is concerned with the description of motion/movement and how forces create motion/movement motion not motion. Of air time you achieve and for ease of understanding, we will consider that there is no resistance... = mu of a setter ( in volleyball ) and him setting the up... A curved path all parts of the body moves in same direction parallelly projectile is any object is. 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