Q. It is easier to roll a barrel full of coal tar than to pull it because
✅ Correct Answer: (B)
the rolling friction is much less than the sliding friction
Explanation: When a body slides (moves with all its surface area in contact) over another body, the resistance faced is due to sliding friction. Hence rolling friction is less than the sliding friction. Thus it is easier to roll a barrel full of coal tar than to pull it.
Explanation by: Vikash Gupta
When a body slides (moves with all its surface area in contact) over another body, the resistance faced is due to sliding friction. Hence rolling friction is less than the sliding friction. Thus it is easier to roll a barrel full of coal tar than to pull it.