Question
____ friction exists between two objects that are in motion relative to each other.
Answer
Kinetic friction exists between two objects that are in motion relative to each other.
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Because weight, and not mass, is used, the British system later derived the ____ as a unit of mass.
Energy on the atomic scale can be expressed in ____.
____ are numbers that have magnitude and direction.
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____ are numbers that have magnitude only and no direction.
Scalars are numbers that have ____.