a)positive b)negative c)zero 2)What is the sign of the work done by friction as

Question

a)positive b)negative c)zero

2)What is the sign of the work done by friction as the block comes to rest on the inclined plane?

a)positive b)negative c)zero

3)What is the sign of the work done by the normal force as the block comes to rest on the inclined plane?

a)positive b)negative c)zero

4)What is the sign of the net work done (by all the forces) on the block as the block comes to rest on the inclined plane?

a)positive b)negative c)zero

5)Now the block is given the same initial velocity up the same inclined plane (but with a smaller coefficient of friction). The block is moving slower than its initial speed as it approaches the end of the inclined plane.

a)positive b)negative c)zero

A block is given an initial velocity up an inclined plane with friction. The block comes to rest before the end of the inclined plane. Vf = 0 Vo 0

Explanation / Answer

here,

a)

as the angle between the component of gravity and displacment is 180 degree

the work done is b) negative

b)

as the angle between the friction and displacment is 180 degree

the work done is b) negative

3)

the work done by the normal force is c) zero

4)

the sign of net work done by all the forces is b) negative

5)

b)negative

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