Advertisements
Advertisements
प्रश्न
When does a force do work?
Advertisements
उत्तर
A force does work whenever there is a displacement in the direction of force applied.
संबंधित प्रश्न
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
State the factors on which moment of force about a point depends.
Name the force needed for circular motion. What is the direction of the force?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
Derive a relation between the S.I. and C.G.S. unit of force.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
