Answer:
80 J
Explanation:
Work = force × distance
W = 20 N × 4 m
W = 80 J
The work done by friction is 80 J.
Work is done by the force of friction is 80 J.
Work is done when a force is applied to an object through a distance. This means that when a force is applied to an object through a distance, the object's total energy will be affected.
Mass of the box, m = 10 kg
Force with which the box is pulled, F = 50 N
It is moved a distance of 4 m
Force of friction acting on the box, f = 20 N
A 10 kg box initially at rest is pulled with a 50 N horizontal force for 4 m across a level surface. The force of friction acting on the box is a constant 20 N.
Work = force × distance
W = 20 N × 4 m
W = 80 J
Hence Work is done by the force of friction is 80 J.
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