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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

(a) A block with a mass m is pulled along a horizontal surface for a distance x by a constant force F at an angle θ with respect to the horizontal. The coefficient of kinetic friction between block and table is μk the force exerted by friction equal to μkmg? If not, what is the force exerted by friction? (b) How much work is done by the friction force and by 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 μk = 0.400, and find I the answers to parts (a) and (b).

images

Figure P5.39

(a)

To determine
The force exerted by the friction.

Explanation

Given Info:

The coefficient of kinetic friction is μk .

Mass of the block is m .

Formula to calculate the friction force is,

fk=μkn       (I)

  • μk is the coefficient of kinetic friction
  • n is the normal force

From the diagram,

n+Fsinθmg=0

On re-arranging,

n=mgFsi

(b)

To determine
The work done by the friction force and by applied force.

(c)

To determine
The forces that do not work on the block.

(d)

To determine
The frictional force, the work done by friction force and applied force.

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