Four free-body diagrams of a block on a ramp are shown. Match each diagram to a

Question

Four free-body diagrams of a block on a ramp are shown. Match each diagram to a situation. E.g., if diag. 1 corresponds to situation D, diag. 2 to situation B, diag. 3 to E and diag. 4 to A, enter DBEA. You have only 4 tries! 1) 2) 3) A. A block is momentarily at rest; it is changing directions - after sliding up a ramp, it is about to slide back down. B. A block is sliding down a ramp at increasing speed. C. A block is sliding down a ramp at decreasing speed D. A block is being dragged up a ramp. E. A block is sliding up a ramp. F. A block is stationary on a ramp.

Explanation / Answer

CBFD

In diagram 1, component of w is less than kinetic friction. Also direction of frictional force is upward. So it is moving downward with decreasing speed.

In diagram 2, component of w is more than kinetic friction, so it is moving downward with increasing speed.

In diagram 3 it is static friction and it is equal to component of w along the plane. So it is stationery.

In diagram 4, tention T is dragging the block upward.

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