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==Key Stage 34==
===Meaning===
A '''force''' is a [[vector]] quantity can affect the [[speed]], direction of motion or shape of an [[object]].
===About Forces===
: The [[SI Unit]] of [[force]] is the [[Newton]] (N).
: A [[force]] can be [[measure]]d using a [[Newton Meter]].
: [[Force]]s follow [[Newton's Third Law]] which states that if an [[object]] 'A' exerts a [[force]] on [[object]] 'B'; then [[object]] 'B' will exert a [[force]] on [[object]] 'A' which is equal in [[magnitude]] but opposite in direction to the original [[force]]. These are sometimes called an [[Action Force|action force]] and a [[Reaction Force|reaction force]]. This means when : : : When you push a wall with a [[force]] of 5N ([[Action Force]]), the wall pushes back with a [[force]] of 5N([[Reaction Force]]). : : 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 can twist, stretch or squash an [[object]]. This is known as [[deformation]].