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प्रश्न
State the condition when the work done by the force is positive
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उत्तर
Work done by a force is positive when the displacement is in the direction of the force.
संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
What do you mean by a centrifugal force?
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
State and define the unit of force in the S.I. system.
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.
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
