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Question: 17. (a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force vector F at an angle θ with respect to the horizontal. The coefficient of kinetic friction between block and table is μk. Is the force exerted by friction equal to μkmg? If not, what is the force exerted by friction? (Assume θ is measured above the

17. (a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force vector F at an angle θ with respect to the horizontal. The coefficient of kinetic friction between block and table is μk. Is the force exerted by friction equal to μkmg? If not, what is the force exerted by friction? (Assume θ is measured above the horizontal.)

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(b) How much work is done by the friction force and by vector F ? (Don’t forget the signs. Use the following as necessary: F for the magnitude of vector F , g, m, x, θ and μk.)

Wfk

= 

WF  = 

(c) Identify all the forces that do no work on the block. (Select all that apply.)

vector F sin(θ)

mvector g

vector F cos(θ)

vector n

friction vector f k

(d) Let m = 2.00 kg, x = 4.80 m, θ = 3.2°, F = 12.0 N, and μk = 0.400, and find the answers to parts (a) and (b). (Include appropriate signs.)

fk  =   N

WF  =   J

Wfk

=   J

Answer

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