Middle School Physical Science Teacher Guide


Features 23 core lab activities that cover the fundamental concepts of Force & Motion, Energy Transfer, Electricity & Circuits, Fluids and more.

Newtons Third Law

Lab Summary

Use two force sensors to measure a pair of oppositely directed forces.


In this activity, students are introduced to Newton’s third law of motion and learn about equal and opposite forces.

Students will investigate the equal and opposite nature of forces while they:

  • Recognize that a force is a push or a pull
  • Recognize that forces have magnitudes (strengths) and directions
  • Relate the sign of the force to the direction, and the magnitude of the force to its strength
  • State Newton’s third law of motion in their own words
  • Gain skills in using scientific measurement tools, the force sensor, as well as the graphing capability of a computer to represent and analyze data
  • Design and conduct a scientific investigation


Students gain experience conducting the following procedures:

  • Setting up the equipment and work area to measure a pair of oppositely directed forces
  • Measuring the forces exerted on a pair of force sensors connected together and pulled in opposite directions

Your Bundle Options:

Option 1:

Middle School Physical Science Bundle


Equipment bundle for teaching 23 Middle School Physical Science Teacher Guide labs.

Option 2:

Middle School Science Standard Sensor Bundle


This bundle contains the probeware needed to perform all 49 lab activities in the Middle School Science through Inquiry lab manual.

Interface Required

This experiment may require software and an interface for data collection.