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If the forces acting on object are balanced (the net force is zero), the object will not accelerate. It will remain at rest or moving with constant velocity. If the forces acting on object are unbalanced (the net force is not zero), the object will accelerate. Its speed and/or direction of motion will change.

Sections:
00:00 - Hitting a puck
01:07 - What makes the puck stop?
03:25 - What if there were no resistive forces?
04:33 - Newton's first law
05:50 - Summary

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