Question 1157720
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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/(m*g)}}} = {{{49.4/(18.4*9.81)}}} = 0.2736.


Kinematic friction coefficient is  {{{45.3/(m*g)}}} = {{{45.3/(18.4*9.81)}}} = 0.2510.
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