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# Ms. Menanno Forces

newton A unit of measure that equals the force required to accelerate 1 kilogram of mass at 1 meter per second per second
net force The overall force on an object when all the individual forces acting on it are added together
unbalanced forces Forces that produce a nonzero net force, which changes an objectâ€™s motion. Cause an object to start moving, stop moving or change direction
balanced forces Equal forces acting on an object in opposite directions. Do not change an objectâ€™s motion
friction The force that one surface exerts on another when the two surfaces rub against each other
static friction Friction that acts on objects that are not moving. Most difficult to overcome
sliding friction Friction that occurs when one solid surface slides over another
rolling friction Friction that occurs when an object rolls over a surface
gravity The force that pulls objects toward each other
mass The amount of matter in an object
weight The force of gravity on an object at the surface of a planet
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
terminal velocity The greatest velocity a falling object can achieve
projectile An object that is thrown or launched
inertia The tendency of an object to resist any change in its motion
momentum A measure of the amount of motion an object has. Momentum = mass x velocity
law of conservation of momentum The rule that in the absence of outside forces the total momentum of objects that interact does not change
force A push or pull exerted on an object
Created by: menannoa

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