A force is a push or a ____. Forces are invisible but can be detected by their ____. Forces can change an object's shape, ____, or direction. Forces are measured in units called ____ (N) names after Sir ____ Newton. Friction is a force which acts whenever two object which are in ____ move or try to move. Friction always acts in the opposite direction to movement, so we say that it ____ motion. Non-contact forces can act on objects without ____ them. ____ is the force that acts on magnetic materials. The electrostatic force acts on ____ objects. Gravity acts on mass, creating a force called ____.

5. Forces recap

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