JAMB - Physics (1995 - No. 44)
A body of mass 40kg is being dragged along the floor by a rope inclined at 60 degrees to the horizontal. The frictional force between the box and the floor is 100N and the tension on the rope is 300N. How much work is done by dragging the box for a distance of 4m
680J
400J
200J
100J
Explanation
Force required to move the object forward = Fcos 60 = 300 x 0.5 = 150N
Frictional Force = 100N
Total force acting on the object = 150 - 100 = 50N
Work Done = Total force x distance = 50 x 4 = 200J.
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