Chapter 5, Problem 40P

(a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force $\stackrel{\to }{\text{F}}$ at an angle θ with respect to the horizontal. The coefficient of kinetic friction between block and table is μ_k the force exerted by friction equal to μ_kmg? If not, what is the force exerted by friction? (b) How much work is done by the friction force and by $\stackrel{\to }{\text{F}}$? (Don’t forget the signs.) (c) Identify all the forces that do no work on the block, (d) Let m = 2.00 kg, x = 4.00 m, θ = 37.0°, F= 15.0 N, and μ_k = 0.400, and find I the answers to parts (a) and (b).

Figure P5.39