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What do you understand by an ideal machi...

What do you understand by an ideal machine ? How does it differ from a practical machine ?

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Ideal machine has 100% efficiency i.e., work done on the machine is equal to the work done by the machine while a practical machine is not 100% efficient due to the energy loss in friction etc.
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ICSE-SAMPLE PAPER 2013-SECTION-II
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  3. State the principle of conservation of energy.

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  6. A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m l...

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  7. A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m l...

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  8. A block and tackle system of pulleys has velocity ratio 4. Draw a ne...

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  9. A block and tackle system of pulleys has a velocity ratio 4. What is...

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  10. Name the radiations : that are used for photography at night.

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  11. Name the radiations : used for detection of fracture in bones.

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  12. Name the radiations : whose wavelength range is from 100 Å to 4000 Å...

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  13. Define the term refractive index of a medium. Can it be less than 1 ?

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  19. A vibrating tuning fork is placed over the mouth of a burette filled w...

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  20. What is meant by the terms (1) amplitude (2) frequency, of a wave ?

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