A 50.0 kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.750 and 0.430, respectively. What horizontal pushing force is required to just start the crate moving?

1 Answer
Trevor Ryan.
Oct 9, 2015

#367,5N#

Explanation:

From Newton's 2nd Law of motion,

#sumF=ma#
#therefore F_(appl)-f_s=ma=0#

Note that acceleration is zero since we consider the moment just as motion begins so at this stage velocityis just zero and by definition #a=(dv)/(dt)#

#therefore F_(appl)=f_s=mu_sN=mu_smg=0,750xx50xx9,8=367,5N#

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