Question

A horizontal force of 160 N is used to push a 50.0 kg packing crate a distance of 7.00 m on a rough horizontal surface. The acceleration of gravity is 9.81 m/s 2 . If the crate moves with constant velocity, calculate a) the work done by the force. Answer in units of J. 005 (part 2 of 2) 10.0 points b) the coefficient of kinetic friction.

Answer 1

Answer: a) 1120Nm b) 0.33

Step-by-step explanation:

a) Work is said to be done when a force applied to an object causes the body to move through a distance. Mathematically,

Work done = Force × distance

To calculate the work done by the force, we will use the formula for work done

Workdone = 160 × 7

Work done = 1120Nm

b) According to friction, coefficient of kinetic friction is equal to the ratio of the moving force (Fm) to the normal reaction (R).

Normal reaction = weight of the object= mass × acceleration due to gravity

R = 50 × 9.81

R = 490.5N

Moving force Fm = 160N

Coefficient of kinetic friction = Fm/R

= 160/490.5

Coefficient of kinetic friction = 0.33