force - the push, pull or twist that can cause a change in shape or motion, weight - measure of the force of gravity on an object, accelerate - to make something move faster, decelerate - to make something slow down, newtons (N) - how force is measured, spring balance - a weighing scale that measures newtons (N), friction - a force that stops things moving, traction - friction of an object on the surface in which it moves, Newtons 2nd Law - Force = mass x acceleration, contact force - the force when one object comes into contact with another, non-contact force - force of pulling or pushing away between objects when there is no contact between them,

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