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force A push or pull exerted on an object. unbalanced forces newton A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second. balanced forces net force The overall force on an object when all the individual forces acting on it are added together. friction Forces that produce a nonzero net force, which changes an object’s motion. static friction Friction that acts on objects that are not moving. Equal forces acting on an object in opposite directions. sliding friction Friction that occurs when one solid surface slides over another. The force that one surface exerts on another when the two surfaces rub against each other. rolling friction Friction that occurs when an object rolls over a surface. fluid friction gravity mass Friction that occurs as an object moves through a fluid. weight The force that pulls objects toward each other. free fall The amount of matter in an object. air resistance The force of gravity on an object at the surface of a planet. The motion of a falling object when the only force acting on it is gravity. The fluid friction experienced by objects falling through the air. terminal velocity projectile inertia The greatest velocity a falling object can achieve. An object that is thrown. The tendency of an object to resist any change in its motion. momentum law of conservation of momentum The product of an object’s mass and velocity. centripetal force The rule that in the absence of outside A force that causes an object to move forces, the total momentum of objects in a circle. that interact does not change. MOTION, FORCES, & ENERGY satellite Any object that orbits around another object in space. CHAPTER 2 SECTIONS 2.1 – 2.5 FLASHCARDS