Atension force of 175 n inclined at 20.0° above the horizontal is used to pull a 40.0 - kg packing crate a distance of 6.00 m on a rough surface. if the crate moves at a constant speed, find (a) the work done by the tension force and (b) the coefficient of kinetic friction between the crate and surface.

(a) Work done by the tension force is 987 J

(b) Coefficient of kinetic friction between the crate and surface is 0.495

Explanation:

(a)

Work done by any force F in moving an object by a distance d making an angle with the direction of force  is given by

Thus work done by the tension force is 987 J

(b)

Normal force on the crate is given by

=>N=332 Newtons

Since crate is moving with constant speed . Therefore using Newtons second law .

Where =coefficient of kinetic friction

=>

=>

Thus coefficient of kinetic friction between the crate and surface is 0.495

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