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# Vocab 10

TermDefinition
Friction The force that one surface that exerts on another when the two surfaces rub against each other.
Static Friction Friction that acts on objects that are not moving.
Sliding Friction Friction that occurs when one solid surface slides over another.
Rolling Friction Friction that occurs when an object rolls over a surface.
Fluid Friction Friction that occurs when an object moves through fluid.
Gravity The force that pulls objects towards each other.
Mass The measure of how much matter is in an object.
Weight A measure of the force of gravity on an object.
Free Fall The motion of a falling object when the only force acting on it is gravity.
Air Resistance The fluid friction experienced by objects falling through the air.
Projectile An object that is thrown.
Compression The part of a longitudinal wave where the particles of the medium are close together.
Tension Stress that stretches rock so that it becomes thinner in the middle.
Force A push or pull exerted on an object.
Newton A unit measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second.
Net Force The overall force on an object when all the individual forces acted on it are added together.
Unbalanced Forces Force that produces nonzero net force, which changes an object's motion.
Balanced Forces Equal forces acting on an object in opposite directions.
Created by: WaffleFish13