a) You are pushing a 142 kg wooden crate in a straight line a distance of 5.1 m

Question

a) You are pushing a 142 kg wooden crate in a straight line a distance of 5.1 m across a wooden floor. The crate is speeding up at 0.30 m/s^2. The static and kinetic coefficients of friction are 0.51 and 0.41, respectively. What is the work done by friction on the crate?

b)

a) You are pushing a 142 kg wooden crate in a straight line a distance of 5.1 m across a wooden floor. The crate is speeding up at 0.30 m/s^2. The static and kinetic coefficients of friction are 0.51 and 0.41, respectively. What is the work done by friction on the crate?

Explanation / Answer

a = 0.30 m/s2
friction force F= 0.41*142*9.81 = 571.14 N
W = F*d = - 571.14*5.1 =- 2912.8 J = - 2913 J

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