| If the resultant force acting on an object is zero, a stationary object remains stationary. A moving object keeps moving at the same speed and in the same direction. If the resultant force acting on an object is not zero, a stationary object begins to accelerate in the direction of the force. A moving object speeds up, slows down or changes direction. Acceleration depends on the force applied to an object and the mass of the object. Resultant force [ This page has been adapted from www.bbc.co.uk/schools/gcsebitesize/science
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