2.Suppose a an 65 N object rests on a perfectly smooth (frictionless) horizontal

Question

2.Suppose a an 65 N object rests on a perfectly smooth (frictionless) horizontal surface. What is the minimum force needed to start the object moving?

A. 65 N

B. 6.6 N

C. 637 N

D.  any horizontal force greater than zero

3.Atwood's machine has two masses attached by a string suspended over a pulley as shown. If m1accelerates upwards after being released from rest, which best compares m1 and m2?

A. m1 < m2

B. m1 = m2

C. m1 > m2

D. cannot be determined

4.A block sliding down a fixed inclined plane slows to a stop. Which of the following is true?

A. A change in the normal force caused the block to stop.

B. The kinetic friction force was less than the component of the weight down the inclined plane.

C. The kinetic friction force was greater than the component of the weight down the inclined plane.

D. The static friction force overcame the kinetic friction force.

WILL RATE IMMEDIATELY , NEED ASAP. THANKS

Explanation / Answer

2) D

Because there is no friction any force greater than zero will move the object.

3) A

Because if m1 accelerates up means m2 is going down and is heavier than m1.

4) C

If the block is slowing down, it means backward friction which is against its motion is greater than downward component of it's weight along the incline.

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