SOLUTION: Nicole is pulling a crate of food across the floor. The crate has a mass of 18.4kg, and when Nicole pulls with a force of 49.4N[W] the crate starts to move. She only needs to pull

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Question 1157720: Nicole is pulling a crate of food across the floor. The crate has a mass of 18.4kg, and when Nicole pulls with a force of 49.4N[W] the crate starts to move. She only needs to pull with 45.3N[W] to keep it moving. Draw Free body diagrams and find the coefficients of friction.
Answer by ikleyn(52900) About Me  (Show Source):
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Nicole is pulling a crate of food across the floor.
The crate has a mass of 18.4 kg, and when Nicole pulls with a force of 49.4 N [W] the crate starts to move.
She only needs to pull with 45.3 N [W] to keep it moving. Draw Free body diagrams and find the coefficients of friction.
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In this problem, there are 2 (two) coefficients of friction.


Static friction coefficient is  49.4%2F%28m%2Ag%29 = 49.4%2F%2818.4%2A9.81%29 = 0.2736.


Kinematic friction coefficient is  45.3%2F%28m%2Ag%29 = 45.3%2F%2818.4%2A9.81%29 = 0.2510.