![]() ![]() The reason is that air resistance will slow the ball down and cause it to lose kinetic energy. We want to find out what happens to the ping pong balls bounce height as we increase the height from which it is dropped. One problem the linear relation between drop height and rebound height doesn't work if the height is too large. According to the USTA regulations ball is tested for bounce by dropping it from a height of 100 inches (2.54 m) onto a bounce between 53 and 58 inches (1.3462 - 1.4732 m) is acceptable Some of the kinetic energy of the ball is lost during the collision with the floor and the ball will not return to the original height. So, the higher you drop the ball from, the more potential energy it has -> the more kinetic energy it has when it hits the floor -> the higher it bounces back up. Then the ball rebounds, although with a slightly lower velocity due to slight energy loss, and bounces back up losing its vertical kinetic energy back into potential energy. AP Physics 1 and 2 Inquiry-Based Lab Investigations: A Teachers Manual was developed by College Board to support AP Physics teachers in implementing an inquiry-based approach in the classroom. In a scenario with two balls being dropped, the bottom ball’s (ball 2) collision with the floor changes its velocity from the downwards direction to upwards. When the ball hits the floor the ball is squeezed transferring the kinetic energy back into potential energy, like in a spring. A stacked ball drop is when two or more balls are stacked vertically and dropped, and the top ball (ball 1) has a rebound height greater than the initial drop height. As it falls the potential energy is transferred into kinetic energy. The higher the drop distance, the more potential energy the ball has. Record the measurement on your lab sheet. Repeat steps 7 and 8 for the ping pong ball. Average the recorded bounce heights from each 50 cm trial together to find the average bounce height for the rubber ball. Have a partner drop the rubber ball from the 25 centimeter mark and record the height of the first bounce in a table like the one below. (Make sure the bottom of the rule is on the floor.) 2. Place the meter rule flat up against the flat wall. This is called the ball’s rebound height. Have a partner drop the rubber ball 5 times from the 50 centimeter mark and record the height in a table. Aim: To determine if initial height interferes or affects the rebound height Apparatus: A tennis ball, A meter rule, a flat wall and floor/surface, pencil, and paper Diagram: Method: 1. It's a matter of conversion of potential energy energy into kinetic energy and vice versa. Have your partner observe the height to which the bottom of the ball bounces on the first bounce. ![]()
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