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From 7th grade book: Chapter 4 Motion and Forces Vocabulary Force-A push or pull exerted on an object Net force-The overall force on an object when all the individual forces acting on an object are added together. Unbalanced force-A nonzero net force that changes an object’s motion. Balanced force-Equal forces acting on an object in opposite directions. Inertia-The tendency of a moving object to continue in a straight line or of a stationary object to remain in place. Newton-A unit of measure that equals the force required to accelerate one kilogram of mass at a rate of one meter per second per second. Friction-A force that one surface exerts on another when the two rub against each other. Sliding friction- the kind of friction that results when you rub sandpaper against wood Rolling friction- the kind of friction that results when a wheel turns on a surface. Fluid friction- the kind of friction that results between oil and a door hinge. Gravity-The force that pulls objects toward each other. Freefall-The motion of a falling object when the only force acting on it is gravity. Projectile-An object that is thrown. Air resistance-The fluid friction experienced by objects falling through air. Terminal velocity-The maximum velocity a falling object achieves. Law of universal gravitation -The law that states that the force of gravity acts between all objects in the universe. Momentum-The product of an object’s mass and velocity. Law of conservation of momentum-The rule that the total momentum of objects in an interaction does not change Pressure-The force that something exerts over a given area; also, the force exerted on a surface divided by the total area over which the force is exerted. Equilibrium-A state in which opposing forces in a system are equally balanced or stable.