Conservation of Momentum
Determine the momentum before and after an inelastic collision between two carts.
Students use velocity and mass information in a 2-cart system to see that momentum is conserved.
Lab Summary
Students will use Motion Sensors to investigate the conservation of momentum. Students will measure the velocity of two carts before and after an inelastic collision.
Theory
In an inelastic collision (as in all collisions) the total momentum of the system remains constant. As the two carts move toward one another, one with (positive velocity and one with negative) this initial momentum will prove the same as the momentum of both carts after they collide and move together as one object. This fact is confirmed with readings from the Motion Sensors and knowledge of each cart's mass.
Downloads
- Computer-based lab (PDF, 560 KB) (560 KB, .pdf)
(student versions)
- Xplorer GLX-based lab (PDF, 524 KB) (524 KB, .pdf)
(student versions)
Method
Use two Motion Sensors to measure the motion of two carts before and after they collide. Compare the momentum of the carts before they collide with the momentum after they collide.
Here's What You Need
U.S. Educator prices shown.
Required for computer-based lab: (See lab download for Xplorer GLX-based lab requirements, which may differ)
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 Products
1.2 m PAScar Dynamics System (ME-6955) - $259
Equip your lab with carts and a high-quality 1.2 m aluminum track.
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.
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
