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Friction
The force that two surfaces exert on each other when they rub against each other
Sliding friction
occurs when two solid surfaces slide over each other
Static friction
acts between objects that aren’t moving
Fluid friction
occurs when two solid object moves through a fluid
Rolling friction
when a object rolls across a surface
Gravity
is a force that pulls an object toward each other
weight
is a measure of the force of gravity on an object
Mass
is a measure of the amount of matter in an object