distance - measuring an objects position at different times, speed - how fast something is going, acceleration - a change in velocity during a period of time, velocity - speed in a given direction, mass - the amount of matter in an object, friction - keeps an object from moving against another object, energy - the ability to do work, potential energy - stored energy, kinetic energy - energy in motion, mechanical energy - the ability to make something move, motion - the change in an objects position, momentum - the mass and velocity of a moving object, force - a push or pull that causes an object to change speed or direction, inertia - the resistance to change in motion, gravity - the pull of an one object on another, fulcrum - the spot where a bar turns, or pivots, reference point - a fixed, unmoving object or location, work - a force acting on something as it moves a certain distance, newton (N) - unit used to measure force, joule - unit used to measure work,

6 Science Chapter 9: Motion and Machines

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