# Direct Measurement Video of a Girl on a Trampoline

#### Summary

## Learning Goals

Students will be able to use a real-life example to study the concept of conservation of energy.

Students will be able to obtain data from the movie and using the conservation of mechanical energy be able to determine the velocity of an object in motion.

## Context for Use

## Description and Teaching Materials

In this video clip it shows a girl jumping on a trampoline. When looking through the video one frame at a time, students can use the grid on screen to determine the height at which she is at to determine her gravitational potential energy. Students will use the height at which she leaves the trampoline, with respect with the ground, and her maximum height to calculate her potential energy at two locations. With this information, students can use the conservation of energy equation to calculate her velocity as she is leaving the trampoline.

This worksheet is intended to use after the students have become familiar with the conservation of mechanical energy equations, it provides the students with some guidance on how to solve for the unknowns. This worksheet could be modified to provide students more guidance if needed or using to introduce the concept of conservation of mechanical energy. Less instruction could be used if you were using this video for an introductory physics course to allow more critical thinking skills and problem solving.

Student Handout (Microsoft Word 2007 (.docx) 17kB Jul13 12)

Here are sample solutions to the student worksheet.

Sample Solutions (Microsoft Word 2007 (.docx) 43kB Jul13 12)

video of person jumping on a trampoline (Quicktime Video 7.7MB Jul9 12) Here is a link to the video where you can download it to your computer.

## Teaching Notes and Tips

## Assessment

## References and Resources

Direct Measurement Video Library

Student Handout (Microsoft Word 2007 (.docx) 17kB Jul13 12)

Sample Solutions (Microsoft Word 2007 (.docx) 43kB Jul13 12)