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chapter 10 vocab
Term | Definition |
---|---|
force | push or pull |
newton | the si unit for the magnitude or strength of force |
net force | the combination of all forces acting on an object |
unbalanced forces | force that causes objects velocity to change |
balanced forces | equal forces acting on one object in opposite directions |
friction | a force that two surfaces exert on each other when they rub against each other |
static friction | the 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 | occurs when a solid object moves through a fluid |
gravity | a force that pulls objects towards each other |
mass | the measure of the amount of matter in an object |
weight | measure of the force of gravity on an object |
free fall | motion of a falling object when the only force acting on it is gravity |
air resistance | acts on objects falling through air |
projectile | an object that is thrown |
compression | an elastic force that squeezes or pushes matter together |
tension | elastic force that stretches or pulls matter |
ineria | tendency of an object to resist a change in motion |
momentum | characteristic mass x velocity (quantity of motion |
law of conservation of momentum | the absents of outside forces that total momentum of objects that interact does not change |
third law of motion | one object exerts force on a second exerts a force equal in the opposite direction |