According to Newton's third law of motion, whenever two objects interact, they exert equal and opposite forces on each other. This is often worded as 'every action has an equal and opposite reaction'. However, it is important to remember that the two forces: act on two different objects are of the same type (eg both contact forces) Examples of force pairs Newton's third law can be applied to examples of equilibrium situations. A cat sits on the ground There are contact gravitational forces between Earth and the cat: the cat pulls the Earth up the Earth pulls the cat down These forces are equal in size and opposite in direction. Pushing a pram There are contact forces between the person and the pram: the person pushes the pram forwards the pram pushes the person backwards These forces are equal in size and opposite in direction. Car tire on a road There are contact forces between the tire and the road: the tire pushes the road backwards the road pushes the tire forwards These forces are equal in size and opposite in direction. A satellite in Earth orbit There are non-contact gravitational forces between Earth and the satellite: the Earth pulls the satellite the satellite pulls Earth

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