Force & Motion: 1-D Frame of Reference

Directly measure how frame of reference affects quantitative measurement of motion, establishing a solid foundation of relative motion.

Lab Summary:

Students will use a Motion Sensor to investigate the concept of relative motion. The students' frame of reference, i.e. point of view, is always as if they are the cart with a Motion Sensor mounted on it. They will investigate four scenarios:

1) The student frame of reference (always the cart with the motion sensor) is stationary. A second cart is moving directly toward the student.

2) The two carts are moving directly toward one another.

3) The two carts are moving in the same exact direction.

4) The two carts are moving away from one another (i.e., in opposite directions).

Download free labs:

(student versions)

Computer-based lab  (PDF, 600 KB)

Xplorer GLX-based lab  (PDF, 232 KB)

Method:

Use the Motion Sensor to measure the motion of carts as they move relative to each other. Analyze the graph of position versus time.

Here's What You Need:

Required for computer-based lab:

(See lab download for Xplorer GLX-based lab requirements, which may differ)

Probeware

• PASPORT Motion Sensor (PS-2103A)
• Xplorer GLX Graphing Datalogger (PS-2002)
  (or alternate PASPORT interface -- see other options)

Other Materials

• PAScar Dynamics System, 1.2 m (ME-6955)
• Cart Adapter Accessory (ME-6743)
• Card stock
• Masking Tape

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