A boy tries to slow down his skateboard by dragging his foot on the ground
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A boy tries to slow down his skateboard by dragging his foot on the ground, exerting a force of 40N that makes an angle of 150∘ with the direction of motion. What is the nature of the work done by this force?
(a) Zero
(b) Negative
(c) Positive
(d) Cannot be determined without knowing the displacement