# The quest to find how x(t) and y(t) depend on t is greatly simplified by the following facts, first discovered by Galileo:

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1 Team: Projectile Motion So far you have focused on motion in one dimension: x(t). In this lab, you will study motion in two dimensions: x(t), y(t). This 2D motion, called projectile motion, consists of a ball projected with an initial velocity in the earth s gravitational field. Basic Principles Consider launching a ball with an initial velocity v o near the surface of the earth where the acceleration of gravity is g. v o (x, y) yo θ o g y 0 x The position of the ball is given by the coordinates (x, y). The position of the ball depends on time t. The motion of the ball is defined by the motion functions: x(t), y(t). Note that at time t = 0, the ball is launched from the point (x, y) = (0, y o ) with the velocity v o. The initial velocity vector v o has magnitude v o and direction θ o. Given the position and velocity of the ball at time zero, can we figure out the position of the ball for all future time? In short, here is the fundamental Kinematic Quest of projectile motion: Given: The Initial Conditions: y o, v o, θ o. Find: The Motion Functions: x(t), y(t). The quest to find how x(t) and y(t) depend on t is greatly simplified by the following facts, first discovered by Galileo: The horizontal x(t) and vertical y(t) motions are completely independent of each other. x(t) = constant-velocity motion. y(t) = constant-acceleration motion. Analyzing the whole complicated motion as a superposition of manageable parts is a paradigm of modern theoretical physics.

2 The theory of projectile motion goes as follows. The general motion functions for any kind of uniformly-accelerated motion in two dimensions are x(t) = x o + v ox t + ½ a x t 2. y(t) = y o + v oy t + ½ a y t 2. Projectile motion is a special case of uniformly-accelerated motion. Near the surface of the earth, the acceleration of gravity points downward and has magnitude 9.8 m/s 2 and therefore (a x, a y ) = (0, 9.8 m/s 2 ). Substituting these special earth gravity values of a x and a y into the general motion functions x(t) and y(t) displayed above, and also setting x o equal to zero for convenience, gives the following motion functions for any object projected in the earth s gravitational field: The Projectile Motion Equations x(t) = v ox t y(t) = y o + v oy t 4.9 t 2 These equations tell you everything about the motion of a projectile (neglecting air resistance). If you know the conditions (y o, v ox, v oy ) at t = 0, then these equations tell you the position (x(t), y(t)) of the projectile for all future time t > 0. Make sure you understand The Projectile Motion Equations. They will be used in all future parts of this lab. Note: In terms of the initial launch angle θ o, the components (v ox, v oy ) of the initial velocity vector v o are v ox = v o cos θ o and v oy = v o sin θ o. v o θ o v o cos θ o v o sin θ o Exercise The initial (t = 0) launch parameters of a projectile are y o = 3.6 m, v o = 8.9 m/s, θ o = 54 o. Where is the projectile at time t = 1.2 seconds? x = m. y = m. 2

3 Part I. An Illustration of the Independence of x(t) and y(t) Roll the plastic ball off the edge of the table. At the instant the ball leaves the table, drop a coin from the edge of the table. Listen for the ball and the coin to hit the floor. Try rolling the ball faster off the table. Summarize your observations: The picture below shows the position of the dropped coin at six different times. The time interval between consecutive positions is the same. The point at which the ball hits the floor is also shown. Use a ruler to draw horizontal and vertical grid lines spaced just right that will allow you to plot the precise location of the ball at six different times. Neglect air friction. Use your six points to sketch the path of the ball as it moves through the air from table to floor. Table Floor Point where ball hits floor 3

4 Part II. The Ball Launcher. Finding the Initial Speed. In this lab, you will use a projectile machine to give the ball an initial velocity, i.e. to project the ball in a certain direction with a certain speed. This ball launcher is a spring-loaded cannon. Note that you can change the angle θ o of the launch (the direction of the v o vector) by tilting the launcher (loosen and tighten the nut). Note that the value of θ o is measured relative to the horizontal. A protractor on the side of the launcher specifies the numerical value θ o. Tilt the launcher so that it is set for a θ o = 30 o launch. Place the plastic ball inside the barrel of the launcher. Use the plunger rod to slowly push down on the ball until you hear and feel the first click. At this first setting, the spring is locked into a state of minimum compression. CAUTION: DO NOT compress the spring beyond the first setting. CAUTION: Always make sure that the launcher is aimed in a SAFE direction, away from people and objects. When it is safe, pull the lever that launches the ball. Observe the projectile motion. What is the Initial Speed of the Projectile? Here you will find the value of v o = the speed of the ball as it exits the launcher. This is known as the muzzle velocity of the cannon. First note that the point at which the ball exits the launcher (leaves the spring) is marked as a dot at the center of the small circle that appears on the side of the launcher. This dot represents the center of mass of the ball (circle). Since the initial speed of the ball is determined by the force of the spring (gravity has a negligible effect), the value of v 0 is constant, independent of the tilt of the launcher. Tilt the launcher so that it points upward in the vertical direction (θ 0 = 90 o ). Launch the ball and observe how high the ball rises. By measuring the maximum height H, you can determine the launch speed v 0. Here is an experimental technique to determine H. On your table is a vertical rod assembly with a small metal plate attached to the rod. Position the plate directly above the launcher near the point where the ball reaches its maximum height. Adjust the plate up or down so that the launched ball barely hits or barely misses the plate. Launch the ball several times, each time fine tuning the vertical position of the plate (slightly up/down) until you are confident (± 1 cm) in the location of the maximum height. Measure the distance from the top of the ball at the launch point to the bottom of the plate. final v = 0 plate initial v 0 H 4

5 Maximum Height: H = m. From this measured value of H, compute the initial speed v 0 of the ball. Show your calculation. Initial Speed: v 0 = m/s. Part III. Discovering the Parabola Geometric trademark of projectile motion: Projectile Path = Parabolic Curve. Launch the ball at some angle and observe the curved path traced out by the ball as it moves through space. It is difficult to map out the exact shape of the path when you only have about one second to make the observation! The path is definitely some kind of curve, but how do you know it is a parabola? Can you rule other shapes: semi-circular arc, or an oval curve, or a cubic curve, or an exponential curve, or a piece of a sine curve? Let s explore the special case of a horizontal launch. Set the launch angle to be θ o = 0 o. y v o ( x(t), y(t) ) y o Table x The Initial Conditions Measure the initial height y o of the ball. Note: measure from the table surface to the bottom of the ball (see picture). Record your previously measured value of the initial speed v o of the ball. y o = m. v o = m/s. These initial parameters, which specify how you start the projectile motion, uniquely determine the shape of the projectile path. 5

6 Mapping Out the Parabola First find the motion functions x(t) and y(t) that specify the position of the ball at any time t between the initial launch time t = 0 and the final hit-the-table time. Hint: Substitute the numerical values of your measured initial parameters y o and v o into The Projectile Motion Equations. x(t) = t. y(t) = + t 4.9 t 2. Compute x(t) at t = 0, 0.05 s, 0.10 s, 0.15 s, 0.20 s and mark these five values of x by placing five dots at the appropriate locations on the x(m) axis shown below. Compute y(t) at the same five times and mark these five values of y on the y(m) axis below. y (m) x (m) Place five dots within the xy plane pictured above that represent the actual five positions of the projectile at the five times considered above. Label each point with the corresponding time. Use these five points as a guide to draw the entire smooth path of the projectile as it flies through the air. Find the equation y(x) that describes this curved path. Hint: Eliminate t from your x(t) and y(t) equations by solving the x equation for t and then substituting this t expression into the y equation. You will be left with y as a function of x which should be a quadratic function of the form y(x) = Ax 2 + C. Show your derivation of y(x) in the space below. The underlined coefficients that you fill in for the parabola equation y(x) are the special parabolic parameters of your projectile motion. y(x) = + x 2. 6

7 Where Does the Projectile Land? In theory, the landing point is defined by the coordinate point (x, y) = (L, 0). y Launch Point 0 x = L Landing Point x Use your parabola equation y(x) to compute the horizontal landing distance L of your projectile. Show your calculation. L (theory) = m. Launch the ball five times. Arrange for the ball to land on a piece of carbon paper, which is placed on top of copy paper taped to the table. The scatter of landing points (dots) recorded on the paper provides a nice visual display of the uncertainty in L. Find the average value of L and the uncertainty in L (half-width spread around the average). L (m) L (experiment) = ± m. Does your value of L (theory) fall within the range of the values of L (experiment)? % difference between L (theory) and L (experiment) is %. 7

8 Part IV. Range, Altitude, Flight Time There are three important properties of projectile motion: Range R Maximum horizontal distance. Maximum Height H Maximum vertical distance. Time of Flight t f Time in air between launch and land. y time 0 Launch H time t f 0 R Land x Theory The Motion Functions Find the motion functions x(t) and y(t) that describe the motion of the ball projected at an angle of θ o = 60 o from your launcher. Use your measured values of y o and v o as the initial parameters in the motion equations. Remember: v ox = v o cosθ o, v oy = v o sinθ o. So as not to clutter the equations, do not include the units of the numbers that you write in the blanks below. But make sure that all your numbers are expressed in the metric units of meters and seconds. x(t) = t. y(t) = + t 4.9 t 2. The Parabola Use your motion functions x(t) and y(t) to compute the position (x, y) of the ball every tenth of a second (t = 0.0, 0.1, 0.2, 0.3,...) until the ball hits the table. Note that the ball hits the table when y = 0. Record the position coordinates (x, y) in the data table below. 8

10 Experiment Set the launcher for a θ o = 60 o launch. Launch the ball and measure t f, H, and R. One person should measure t f the hang time of the ball through the air with a stopwatch. Another person should measure H the maximum altitude with a meter stick and a simple visible inspection of where the trajectory of the ball peaks. Use carbon paper on top of copy paper to record the landing point. Measure the range R the horizontal distance between the launch point and the landing point with a meter stick. Repeat this 60 o launch four more times. Fill in the table. Find the average values of your measured parameters R, H, and t f. Experimental Values of the Projectile Motion Parameters R (exp) H (exp) t f (exp) Average m m s Compare Theory and Experiment % diff between R (theory) = and R (exp) = is %. % diff between H (theory) = and H (exp) = is %. % diff between t f (theory) = and t f (exp) = is %. If any percent difference is greater than 10%, then consult your instructor. 10

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