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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.
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
Name two places in india where electricity is generated from nuclear power plants.
State the factors on which moment of force about a point depends.
In which one of the following cases is the work done more? When the angle between the direction of motion and that of the force is (i) 90° (ii) 0°.
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 two conditions for work to be done.
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
