Work Power Energy – SMART MOVE LEARNING

Work Power and Energy

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1. The mass of a bucket containing water is 10 kg. What is the work done in pulling up the bucket from a well of depth 10 m if water is pouring out at a uniform rate from a hole in it and there is loss of 2kg of water from it while it reaches the top

1000 J

800 J

900 J

500 J

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2. In an elastic collision of two particles the following is conserved

Kinetic energy of each particle

Speed of each particle

Momentum of each particle

Total kinetic energy of both the particles

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3. n small balls each of mass m impinge elastically each second on a surface with velocity u. The force experienced by the surface will be

½ mnu

4 mnu

2 mnu

mnu

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4. A body of mass 40 kg having velocity 4 m/s collides with another body of mass 60 kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy will be

144 J

440 J

392 J

48 J

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5. The potential energy of a certain spring when stretched through a distance ‘S’ is 10 Joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘S’ will be

10

30

20

40

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