Force,Energy and simple machines

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A (a)   force happen when two object are interact.

(a)   surfaces cause more Friction than the smooth ones.

A spring returns to its natural length because of (a)   force.

(a)   is the force that makes thing fall on Earth.

Kientic energy of the (a)   things.

Solar pannels convert heat and light from the sun into (a)   energy.

A (a)   uses a rope moving around the edge of a wheel to lift havy objects.

A road up a hill is the example of and (a)   plane.

The point on which a lever is supported is called the (a)   .