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ch. 10 forces
science
Question | Answer |
---|---|
force | push or pull |
newton | the si unit for the magnitude or strength of a force |
net force | the combination of all forces on a object |
unbalanced forces | when ever there is a net force acting on a object |
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 | friction that occurs when an object isn't moving |
sliding friction | occurs when two solid surfaces slide over each other |
rolling friction | when a object rolls across a surface |
fluid friction | occurs when a solid object moves through a fluid |
gravity | a force that pulls object toward each other |
mass | the measure of amount in an object |
weight | the gravitational force exerted on a person or object at the surface of a planet |
free fall | when the only force acting on a object is gravity |
air resistance | a type of fluid friction that acts \on a object falling through air |
projectile | an object that is thrown |
compression | an elastic force that squeezes or pushes matter together |
tension | an elastic force that stretches or pulls matter |
inertia | the tendency of an object to resist a change in motion |
momentum | characteristic of a moving object that depends on both the mass and velocity of the object |
law of conservation of momentum | in the absence of outside forces the total momentum of objects that interact does not change |