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chapter 10
Question | Answer |
---|---|
force | a push or pull exerted on a object |
newton | the SI unit used for the magnitude, or strength, of a force |
net force | the overall force on an object when all the individual forces acting on it are added together |
unbalanced forces | forces that cause an object's velocity to change |
balanced forces | equal forces acting on an object in opposite directions |
friction | the force of two surfaces rubbing together |
static friction | friction that acts on objects that aren't moving |
sliding friction | when to solid surfaces slide over each other |
rolling friction | an object that rolls across a surface |
fluid friction | when a solid object passes through water |
gravity | a force that pulls objects toward each other |
mass | the amount of matter an object has |
weight | the gravitational pull on a person or object |
free fall | when the only acting on a object is gravity |
air resistance | a type of fluid friction that acts on objects falling through the air |
projectile | an object that is thrown |
compression | an elastic force that pushes matter together |
tension | the elastic force that pulls matter apart |
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 |
inertia | the tendency of an object to resist any motion |