Force,Energy and simple machines

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A _______ force happen when two object are interact.

______ surfaces cause more Friction than the smooth ones.

A spring returns to its natural length because of _______ force.

__________ is the force that makes thing fall on Earth.

Kientic energy of the ________ things.

Solar pannels convert heat and light from the sun into __________ energy.

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 __________ plane.

The point on which a lever is supported is called the ________.