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# Ch 2 Forces

TermDefinition
force a push or pull exerted on an object
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
friction the force that two surfaces exert on each other when they rub against each other
sliding friction friction that occurs when one solid surface slides over another
static friction friction that acts between objects that are not moving
fluid friction friction that occurs as an object moves through a fluid
rolling friction friction that occurs when an object rolls over a surface
gravity the attractive force between objects; the force that moves objects downhill
mass the amount of matter in an object
weight a measure of the force of gravity acting on an object
inertia the tendency of an object to resist a change in motion
momentum the product of an object's mass and 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
free fall the motion of a falling object when the only force acting on it is gravity
satellite an object that orbits around another object in space
centripetal force a force that causes an object to move in a circle
Created by: lrlong