A) Friction between the wheels and the ground becomes negligible
B) Static fiction, which is greater than rolling friction, comes into play
C) Sliding friction, which is greater than rolling friction, comes into play
D) Friction between the wheels and the ground starts opposing the motion
Correct Answer: C
Solution :
When the wheels of the bag are suddenly locked, the rolling friction loses its role. It is the sliding friction that comes into play. Sliding friction is always greater than rolling friction. Therefore, it becomes difficult to drag the bag when the wheels stop rotating and start sliding. The correct answer is C
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