Answer :
Final answer:
Skipping occurs when a bit loses contact with the nail due to exceeding the maximum static friction force. This skipping can happen when the force applied by the bit is greater than the maximum static friction force between the bit and the nail.
Explanation:
Skipping occurs when a bit loses contact with the nail and jumps across the surface. This can happen due to a phenomenon called static friction. When the bit is moving along the surface of the nail, static friction provides the necessary force to keep it in contact with the nail. However, if the force applied by the bit exceeds the maximum value of static friction, the bit can lose contact and skip.
One way to visualize this is by considering a block resting on an inclined plane. The force of gravity acts on the block, trying to pull it down the plane. However, the static friction force between the block and the surface of the plane opposes this motion. As long as the force applied by gravity is less than the maximum value of static friction, the block remains stationary. But if the force from gravity exceeds the maximum static friction, the block will start sliding.
Similarly, when the bit is moving along the nail, there is a force from the bit pushing it forward and a force from static friction opposing this motion. As long as the force from the bit is less than the maximum static friction, the bit stays in contact with the nail. However, if the force from the bit exceeds the maximum static friction, the bit loses contact and skips across the surface of the nail.
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