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OpenStudy (anonymous):

Input force and output force: Help Please

OpenStudy (anonymous):

Sergio noticed that after oiling his skateboard wheels, it was easier to reach the speeds he needed to perform tricks. How did the oil help? 1.the oil reduced friction between the moving parts of the skateboard. 2.the oil increased friction between the moving parts of the skateboard. 3.the oil reduced friction between the skateboard wheels and the ground. 4.the oil increased friction between the skateboard wheels and the ground.

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