physics 2.3
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8 Terms
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Newtons first law
An object won’t change its motion unless a force is acting on it
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Resistive forces
air resistance, rolling friction, sliding friction
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What happens if the direction of the resultant is perpendicular to the direction of the objects motion?
the direction of the motion changes
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What happens if the direction of the resultant is at an angle but not perpendicular to the direction of the objects motion?
the direction and the speed of the motion change
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Free fall
when gravity is the only force acting on an object
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How fast does an object fall with freefall?
9.81 m/s2
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Weightlessness
the feeling of nothing supporting you
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formula for acceleration
a = change in speed / change in time
Note 
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