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Ch 10
Question | Answer |
---|---|
Force | A push or pull |
Newton | The SI unit for the magnitude, or strength of a force |
net force | The combination of all forces acting on an object |
unbalanced forces | cause change in velocity which is a force |
balanced forces | Equal force acting on one object in opposite directions |
Friction | The force that one surface exerts on another when the two surfaces rub against each other |
static friction | A friction that acts on objects that are not moving |
Sliding friction | occurs when two solid surfaces slide over each other |
Fluid friction | occurs when a solid objects moves through a fluid |
gravity | a force that pulls objects towards each other |
weight | the gravitational force exerted on a person or object at the surface of a planet |
free fall | when the only force acting on an object is gravity the object is in free fall |
Air resistance | fluid friction that acts on objects falling through the air |
projectile | an objects that is thrown |
compression | an elastic force that squeezes or pushes matter together |
tension | AN elastic force that stretches or pulls matter |
Inertia | Galileo's concept of the resistance to a change in motion |
momentum | another name for momenetum |
Law of conservation of momentum | in the absence does not change |
satellite | any object that orbits another object in space |
centripetal force | any force that causes an object to move in a circular path |
rolling friction | friction occurs when an object rolls over a surface |