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→Key Stage 4
:: If 'head' a football with a force of 10N then your head provides a [[force]] of 10N ([[Action Force]]) to the ball and the ball provides a [[force]] of 10N to your head ([[Reaction Force]]).
: [[Force]]s can cause an [[object]] to [[accelerate]].
: A pair of opposing [[force]]s applied to different parts of an [[object]] can twist, stretch or squash an the [[object]]. This is known as [[deformation]].