In this lab you will analyze two video clips. The clips shows bouncing balls. By measuring the maximum height a ball reaches after each bounce, you can determine the coefficient of restitution of the ball. For a review, click here.
To play the video clip or to step through it frame-by-frame click the "Begin" button. The "Video Analysis" web page will open. You can toggle between the current page and the "Video Analysis" page by pressing Alt-Tab. Choose the restitution_1.avi video clip to determine the coefficient of restitution of a super ball and the restitution_2.avi video clip to determine the coefficient of restitution of a golf ball.
 | For instructions on how to use "Video Analysis on the Web" refer to a previous exercise. |
The ball starts with no kinetic energy and potential energy U=mgh1. As it contacts the floor, it has no potential energy but kinetic energy K1=U1, or (1/2)mv12=mgh1. After the bounce, just as it breaks contact with the floor it has kinetic energy K2=(1/2)mv22 and no potential energy. When it reaches its maximum height after the bounce, it has no kinetic energy, but potential energy U2=K2,or mgh2=(1/2)mv22.
We therefore have K2/K1=U2/U1, or v22/v12=h2/h1.
Open Microsoft Word and prepare a report using the template shown below.
| In a few sentences summarize the experiment. |
| How did you determine the coefficient of restitution? Describe your procedure. |
| What value did you obtain for the coefficient of restitution of the super ball? |
| What value did you obtain for the coefficient of restitution of the golf ball? |
| Which ball is the "livelier" ball? |
Save your Word document (your name_lab6.doc) and attach it to an e-mail message to mbreinig@utk.edu.