040 - Interaction Forces In this video Paul Andersen explains how forces on an object always require another object. An object cannot exert a force on itself. If net forces on an object are balanced the object will remain at rest or move with a constant velocity. However if the net forces are unbalanced the object will accelerate in the direction of the net force.


  • Science > Physics

Education Levels:

  • Grade 9
  • Grade 10
  • Grade 11
  • Grade 12


Physics, Forces, Interaction, Object, System



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Public - Available to anyone

License Deed:

Creative Commons Attribution Non-Commercial


Student Resources
Update Standards?

HS-PS2-1: Next Generation Science Standards

Analyze data to support the claim that Newton's second law of motion describes the mathematical relationship among the net force on a macroscopic object, its mass, and its acceleration.

HS-PS2-2: Next Generation Science Standards

Use mathematical representations to support the claim that the total momentum of a system of objects is conserved when there is no net force on the system.
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