Question 2 You are pushing a 150-kg wooden crate in a straight line a distance o

Question

Question 2

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor at constant speed. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by friction on the crate?

Question 3

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor at constant speed. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by you on the crate?

Question 4

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor. The crate is speeding up at 0.33 m/s2. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by friction on the crate?


Question 5

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor. The crate is speeding up at 0.45 m/s2. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by you on the crate?

Explanation / Answer

Friction force = u*m*g , u = kinetic fri. coeff .

= 0.3*9.8*150 = 441 N

work = f* s = - 441*4.5= -1984.5 J , work is -ve bcoz distance is opposite to direction of force

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