A Block Is Pulled at Constant Speed Along a Rough

question 15

Multiple Choice

A block is pulled at constant speed along a rough level surface by a rope that makes an angle of 30° with respect to the horizontal. The applied force along the rope is . The force of kinetic friction between the block and the surface is 10 N.
-Which one of the following actions will increase the frictional force on the block?

• A)increasing the contact surface area
• B)decreasing the contact surface area
• C)increasing the weight of the block
• D)decreasing the speed of the block
• E)increasing the angle made by the rope

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