Mass - the measure of the amount of matter in a body, Friction - force that resists the sliding or rolling of one solid object over another, Balanced Forces - Forces that are opposite in direction and equal in size. Balanced forces are considered to be in a state of equilibrium. When forces are balanced there is no change in direction. Combined forces that are balanced are always equal to zero., Unbalanced Forces - The force applied in one direction is greater than the force applied in the opposite direction. When unbalanced forces are acting on an object, there is a change in speed and/or direction., Gravity - The force by which a planet or other body draws objects toward its center, Force - A push or a pull on an object, Motion - the change in position of an object with respect to its surroundings in a given interval of time, Speed - how fast an object is moving, Momentum - mass in motion,

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