Question: A 38 kg crate rests on a floor. A horizontal pulling force of 170 N is needed to start the crate moving. 1.What is the

A 38 kg crate rests on a floor. A horizontal pulling force of 170 N is needed to start the crate moving. 

1.What is the coefficient of static friction between the crate and the floor? 

2.The same crate as in the previous question only requires a 120 N force to keep it moving at constant speed. 

3.What is the coefficient of sliding (kinetic) friction?

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