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Force
a push or pull on an object
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Contact Force
a push or pull on an object by another that is touching it
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Gravity
is an attractive force that exist between all objects that have mass
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Noncontact force
a force that one can apply to another object without touching
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Mass
is the amount of matter in an object
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Weight
is the gravitational pull force exerted on an object
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Friction
is a force that resist motion of two surface that are touching
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Static Friction
Prevents surfaces from sliding past each other
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Sliding Friction
Opposes the motion of surfaces sliding past each other
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Fluid friction
Friction between a surface and a fluid