Physics 25 IB May 17, 2022 Efficiency of a Bouncing Ball Lab Hypothesis Determine the efficiency of a ball after dropping it on the floor and measuring how high it bounced. Variables Controlled: Height ball is released at, Surface ball is dropped on Manipulated: Type of ball used Responding: Height of the ball’s bounce Materials - Meter Stick - Tennis Ball - Baseball - Pool Ball - Wiffle Ball - Paddle Ball - Level surface - Recording Device Procedure 1. Hold the meter stick perpendicular to the floor. 2. Set up the recording device in front of the meterstick so it is level with the ball’s initial drop height. 3. Hold the bottom of the ball at the 75cm mark on the meter stick. 4. Start the recording device. 5. Drop the ball. 6. Stop the recording device, and analyze video to see the highest point the ball has reached after the first bounce. 7. Record the data collected in a table (shown below): Table 1.0: Final height of each ball after dropping Trial # Tennis Ball final drop height, ℎ𝑓 (m) Baseball final drop height, ℎ𝑓 (m) Pool ball final drop height, ℎ𝑓 (m) Wiffle Ball final drop height, ℎ𝑓 (m) Paddle Ball final drop height, ℎ𝑓 (m) Uncertainty in final height (m) Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 8. Repeat steps 3-7 until 5 trials are completed. 9. Change out the ball and repeat steps 3-8 until all balls have had 5 trials. 10. Using each ball's respective five trials, take their mean values and enter them into a table. 11. Using the initial drop height (0.75m, ℎ𝑖) and final mean drop height of each ball (ℎ𝑓), calculate the percent efficiency using the formula ℎ𝑓 ℎ𝑖 = eff%.