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speed rate at which another object moves friction a force that causes an oject to slow down and finally stop constant speed speed of an object that doesn't change force a push or pull horizontal line that runs across a graph average speed speed of an object that changes vertical line that runs up and down on a graph velocity speed in a given direction instantaneous speed the speed of an object at any instant of time accerelation the change in velocity divided by the time needed for the change to occur gravity the pull that all objects exert on each other Newton's first law of motion an object will not change its motion unless a force acts on it friction a force that resists motion between two surfaces that are in contact inertia the tendency to resist a change in motion Newton's 2nd law of motion a net force acting on an object changes the motion of the object Newton's 3rd law of motion when one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object work when a force causes an object ot move in the same direction that the force is applied simple machine a machine that uses only one movement compound machine a combination of simple machines mechanical advantage the number of times the applied force is increased by a machine pulley an object with a groove with a rope or chain running through the groove lever a rod or plank that pivots about a fixed point inclined plane a sloped surface, ramp