Negative Work
Trending Questions
Q. Figure shows four situations in which a force acts on a box while the box slides rightward a distance d across a frictionless floor. The magnitude of the forces are identical with their orientations as shown. Identify under which condition the work done on the box during the displacement will be negative.
Q. A ball is thrown vertically upwards, it reaches the height h and then returns to the initial position. Work done by gravity when ball moves upwards is W1 and W2 when ball moves in downward direction. Then
- W1=mgh, W2=mgh
- W1=mgh, W2=−mgh
- W1=−mgh, W2=mgh
- W1=−mgh, W2=−mgh
Q. A rigid body of mass m kg is lifted with uniform velocity by a man to a height of 1 m in 30 seconds. Another man lifts the same mass with uniform velocity to the same height in 60 seconds. The work done on the body against gravity by them are in the ratio
- 1:2
- 1:1
- 2:1
- 4:1
Q. A ball is thrown vertically upwards, it reaches the height h and then returns to the initial position. Work done by gravity when ball moves upwards is W1 and W2 when ball moves in downward direction. Then
- W1=mgh, W2=mgh
- W1=mgh, W2=−mgh
- W1=−mgh, W2=mgh
- W1=−mgh, W2=−mgh
