Third Law of Motion

When one object exerts a force upon another object, the second object exerts an equal and opposite force upon the first object.


Also known as:for every action there is an equal and opposite reaction;The Third Law of Motion deals with balanced and unbalanced forces.

When the forces on an object are unbalanced, motion occurs.

The third law of motion explains the generation of thrust by a jet and rocket engine and the motion of a college racing shell.

University of Minnisotta Crew 2002


Download the lesson inquiry

Lesson Inquiry

Review the following information and complete the Lesson Inquiry.

Newton's Laws of Motion


Describe how the third law of motion moves the racing shell forward?

Describe inertia and

Recal the results of the rocket experiment.  How the ballons illustrate the 3rd Law of Motion?


  1. Take a piece of 8 1/2 by 11 piece of paper.
  2. Fold the paper in fourths.
  3. Tear one of the quarter peace of paper lengthwise.  You will have a strip of paper approximately 2 inches wide and 11 inches long.
  4. Prediction --

    Will the paper blow upward or downward?

  5. Hold the paper on your bottom lip in blow out over the top of the paper.

What, if any imbalances, caused the result of the experiment?

Complete a lab write-up and turn in your write-up or e-mail it to your instructor.

Done Early?

Research rocket fuels and the how engines propel rockets into space. Attach a one page essay on the results of research.

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Last modified: 5/30/2012