Advertisements
Advertisements
प्रश्न
State the condition when the work done by the force is negative.
Advertisements
उत्तर
Work done by a force is negative when the displacement is in the direction opposite to the force.
संबंधित प्रश्न
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
What do you understand by the clockwise and anti clockwise moment of 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.
State and define the unit of force in the S.I. system.
Give the units of couple.
State the condition when the work done by the force is positive
A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.
State the C.G.S. unit of work. How it is related to its S.I. unit?
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).
