Q:

Which one describes when an unbalanced force is acting?

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Which one describes when an unbalanced force is acting?


  1. an object’s centre of gravity is above its base of support.
  2. a moving object maintains a constant speed and direction.
  3. a muscle contracts and causes a limb to move.
  4. a soldier is standing rigidly to attention.

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C: An unbalanced force will result in some movement. The movement of the limb indicates that an unbalanced (muscle) force was acting. 

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