Lab5Elliott

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Rowan College of South Jersey, Sewell *

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110

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Physics

Date

Dec 6, 2023

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pdf

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Uploaded by meggo1704

PHY 111 Lab: Projectile Motion Objective:  Study motion in 2-Dimensions.  Understand the parameters that determine range of an object. Equipment:  Large area, a tennis ball, meterstick, and a small target Part 1: Observation 1. Place a target between 2 to 3 meters away from a starting position. A person standing from the starting position should try to hit the target. You may have to do this multiple time before you are able to hit the target. (Make sure to mark the starting position.) 2. Draw the motion of the ball. (you may draw it on separate paper and insert an image). NOTE: Your best sketch is fine. I am not expecting fine artwork. 3. Keeping the projectile at the same location as (3), now throw the ball such that the ball goes higher compared to (2) yet is still able to hit the target. What did you do in order to achieve this? I increased the angle upwards at which I threw the ball so it went higher but still hit the target.

Part 2: Velocity of a cannonball For the next two parts of this experiment you will be using the Phet interactive simulation. Visit the following website to get started: https://phet.colorado.edu/en/simulation/projectile-motion 1. Use intro tab to test your ideas about the things that affect the landing of a projectile. 2. Pick an initial height. Set the angle to 0°. Initial height: y i = ¿ 7 meters 3. Find the time and range of the cannon ball for different initial speed using the simulation. 4. Using the range, time and kinematic equations, calculate the final speed of the cannonball in x- and y- direction. Fill the values in the table. Initial Speed (m/s) Δ x (m) Time (s) v x v y 3 3.58 1.19 1.37 2.67 6 7.17 1.19 4.29 4.19 12 14.34 1.19 10.78 5.26 18 21.5 1.19 17.12 5.57 25 29.87 1.19 24.34 5.70 5. As you increased the speed, what happens to the time and range? Do they increase, decrease, remain the same? The time remained the same but the range increased with the velocity. Part 3: Angle Dependence 1. Set the height of the cannon to 0 m and initial speed to 12 m / s. 2. Using the distance measuring tool, measure the distance from the cannon to where the object lands for different angles. 3. Calculate the initial velocities in the x any y directions using initial speed and angles. (this is different than finding final velocities)

Angle (°) Δ x ( m ) Time (s) v 0 x ( m / s ) v 0 y ( m / s ) 25 11.24 1.03 10.88 5.07 30 12.71 1.22 10.39 6.00 35 13.76 1.4 9.83 6.88 40 14.46 1.57 9.19 7.71 45 14.68 1.73 8.49 8.49 50 14.46 1.87 7.71 9.19 55 13.79 2 6.88 9.83 60 12.71 2.12 6.00 10.39 65 11.24 2.22 5.07 10.88 4. As you increase the angle, what happens to displacement? It increases then decreases. 5. At what angle is the displacement at a maximum? 45 Degrees. 6. For the angle at which the displacement is same, is the time also same? Why or why not? No because the cannonball has to travel a further distance before it hits the ground.

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