Forces can be balanced or unbalanced., If a force is applied to an object it will generate an acceleration. , Every action has an equal and opposite reaction. , There are three types of friction, sliding, rolling and static friction. , A force is a push or pull on an object., Gravity is a force that pulls objects down toward Earth., Friction works in the opposite direction to the movement force., An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an external force. , Unbalanced forces will cause an object to move., A smooth surface will have less friction than those with a rough surface.,

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