Question

after he gets the block to move, what does dr. hewitt do to drag the block across the table at a steady rate? view available hint(s)for part a after he gets the block to move, what does dr. hewitt do to drag the block across the table at a steady rate? he continues to apply a steady force. he applies a steadily decreasing force. he applies a steadily increasing force.

Answer 1

Continue applying a steady force.

(Assumptions: the table is level, and that the texture of the table is consistent across the entire surface.)

Step-by-step explanation:

The following are the forces on this moving block:

• Weight. (Constant.)
• Normal force from the table.
• Kinetic friction from the table.
• Force from the person dragging the block.

Since the block is moving along the table, the friction on it would be kinetic friction. Kinetic friction depends only on the normal force and the coefficient of kinetic friction.

If the table is level, normal force on the block would be equal in magnitude to weight of the block- which is constant.

If the texture of the table surface is consistent, the coefficient of kinetic friction would also be constant.

Hence, the kinetic friction on this block would be constant.

When the block moves at a constant velocity, the block would be in translational equilibrium. All forces on the block would be balanced.

The normal force from the table would balance the weight of the block. Hence, the force from the person dragging the block needs to be the opposite of the kinetic friction. Since kinetic friction on the moving block stays the same, the force that the person exerts (the opposite of kinetic friction) also needs to stay the same.