distance / time - Speed = , Total distance of journey / total time taken - Average speed = , Shows the speed of the object - Gradient on a distance / time graph , Shows that something is accelerating /decelerating - Curved line on a distance / time graph, 3600 - How many seconds in an hour, 60 - How many seconds in a minute, 1000 - How many metres in a km, 1.25 hours - 75 minutes, A force is exerted on an object without having to touch it - Non-contact force , Newtons - Force is measured in , Nothing moves - With balanced forces, extension of a spring is directly proportional to the force that is applied to it - Hooke's Law states, length of spring - original length of spring - Extension of a spring =, point at which the object's weight acts - centre of mass = , in the middle - in a uniform shape the centre of mass is, a wide base and a low centre of mass - a stable object has, 100 - how many cm in a metre, object is stationary  - a horizontal line on a distance v time graph is, mass (kg) x g (N/kg) - Weight (N) = ,

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