A rock is suspended from a string; and it accelerates downward. Which one of the

Question

A rock is suspended from a string; and it accelerates downward. Which one of the following statements concerning the tension in the string is true? (1.6pts) The tension is greater than the weight of the rock. The tension is independent of the magnitude of the rock's acceleration The tension is equal to the weight of the rock. The tension is less than the weight of the rock. The tension points downward. 2) A friction force (1.6pts) is a contact force that acts parallel to the contact surfaces. does not depend on the nature of the surfaces. is a normal force between contact surfaces. is a scalar quantity since it can act in any direction along a surface. 3) A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50. Suppose that the block now moves across the surface with constant speed under the action of a horizontal 3.0-N force. Which statement concerning this situation is not true? (1.6pts) The direction of the total force that the surface exerts on the block is vertically upward. The net force on the block is zero newtons The frictional force on the block has magnitude 3.0 N. The block is not accelerated The coefficient of kinetic friction between the block and the surface is 0.30. 4) A 10-kg block is pushed against a vertical wall by a horizontal force of 100 N. The coefficient of static friction,

Explanation / Answer

1.The tension is equal to the weight of the rock

2.is a normal force between contact surfaces. is a scalar quantity since it can act in any direction along a surface

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