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# Ch 10

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
Created by: xvelasco