Conservation of Energy
Determine the relationship between the kinetic energy and potential energy of a falling object.
Create clear visual evidence of the conservation of energy-in real-time. DataStudio can perform calculations on data as it is collected-in this case as the motion sensor collects position vs. time data, and the data is instantly calculated and graphed as energy (Joules). To clearly focus on the concept of conservation, the sum of potential and kinetic energy is also calculated and graphed in real-time.
Lab Summary
Students will use a Motion Sensor to observe and investigate the law of conservation of energy. By controlling the height from which a ball is dropped, students will discover the conservation of the gravitational potential energy and the kinetic energy of the ball.
Theory
As an object falls and gains velocity from the acceleration of gravity, potential energy is converted to kinetic energy. Measuring an object's height and velocity at different points as it falls allows calculations to show that the mechanical energy is conserved.
Downloads
- Computer-based lab (PDF, 584 KB) (582 KB, .pdf)
(student versions)
- Xplorer GLX-based lab (PDF, 312 KB) (311 KB, .pdf)
Method
Use a Motion Sensor to measure the motion of a ball as it falls from a given height. Determine the object's GPE and the final KE. Compare the change in GPE to its final KE.
Here's What You Need
U.S. Educator prices shown.
Probeware
PASPORT Motion Sensor (PS-2103A) - $80
Accurately measures position, velocity, and acceleration of a target. For use with PASPORT Interfaces.
Xplorer GLX (PS-2002) - $349
The Xplorer GLX is a data collection, graphing, and analysis tool designed for science students and educators.
Other Materials
Right Angle Clamp (SE-9444) - $16
This clamp fits rods up to 18 mm (11/16 in) in diameter.
Large Rod Base (ME-8735) - $89
A sturdy, general-purpose base can support one or two rods, and is ideal for experiment setups that require extra stability.
Ohaus Triple-Beam Balance (without Tare) (SE-8723) - $147
This Ohaus triple-beam mechanical balance (without tare) is accurate and easy to use. This balance has been a standard weighing instrument in student laboratories for decades.
Other Materials
- Object: Styrofoam Ball, Foam Puck, Basketball
Lab Manual
The computer-based activity is included in Explorations in Physics (PS-2810). The Xplorer GLX-based lab is included in Physics with the Xplorer GLX (PS-2826). Both manuals are complete with Teacher Information pages, student instructions and handouts, and sample data.
For your convenience, we offer bundles which provide the probeware for the activities in the manual. For more, please see:
Computer-based Physics Lab Manual and Bundles
Xplorer GLX-based Physics Lab Manual and Bundles
