40 inch tennis ball - Tennis Review

40 inch tennis ball

Purpose: The purpose of this lab is to determine the relationship between height and gravitational potential energy. The independent variable was the height of the drop of the tennis ball, as measured in inches. The dependent variable is the height of the ball drop, as measured in feet. ??? listed as both IV DV? proofread!The independent variable is the measure of gravitational potential energy, as measured in ball bounces. The controlled variables are the type of ball, weight of ball, and amount of exerted force used when dropping the ball. In order to measure the effect of height on gravitational potential energy, various heights had to be tested. Thus, the dependent variable would best be measured through number of ball bounces. We chose to use a tennis ball because it is a ball that bounces easily, and thus displays a high gravitational potential energy. The same ball had to be used throughout the entire experiment to ensure that these variables were controlled.

Summary: In order to conduct this experiment, we first obtained one tennis ball and two 40 inch ruler sticks. We then dropped the tennis ball from various heights (20 inches, 40 inches, 60 inches, and 80 inches.) We then recorded the number of bounces the tennis ball had taken before it had started rolling. We repeated the experiment once for each height to ensure the accuracy of each drop.

Photos:

title backwards

Data Analysis:

Verbal Model: As the height of the ball increases, the amount of gravitational potential energy increases proportionally.

Math Model: GPE =(0.5 bounces/inch)(height) + ?

Slope: For every inch of height of the tennis ball, the ball may bounce 1/20 times. 1/2 or 1/20? doesn't match math model

Y-Intercept: There is no y intercept in this graph. This means that when the ball is at a height of zero inches, there is no gravitational potential energy.



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