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Ch 2 Forces
Term | Definition |
---|---|
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 |