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7th Grade Unit 6: Forces and Motion Lesson 1: Unbalanced Forces and Motion Vocabulary of Instruction: Accelerate • Speed up or to increase the speed of an object (to push the gas on a car). Newton’s First Law of Motion • An object remains at rest or in motion with a constant velocity unless acted upon by an external force. Inertia • The tendency of an object to stay at rest or to continue to move at the same velocity (speed plus direction), unless acted on by an external force. State of Motion • An object that is moving from one place to another and is defined by its velocity (the speed with a direction). Decelerate • To slow down the speed or velocity of an object (applying the brakes to a car). Kinetic • Moving or causing motion of an object. Kinetic Friction • Is when an object slides on a surface. Static • Is usually used to describe objects at rest or forces in equilibrium. Static Friction • Is a force between two stationary surfaces that inhibits motion. (Static Friction is always greater than kinetic friction). Equilibrium • Is when two forces find a state of balance where no more change occurs. Magnitude • The size of a force. Friction • Is a force that appears whenever one surface rubs against another and that impedes motion (when an object moves through water, air, or any other liquid or gas.