What do you understand by an ideal machine? How does it differ from a practical machine?
What do you understand by an ideal machine? How does it differ from a practical machine?
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An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.
| Ideal machine | Practical machine |
| Efficiency is 100%. | Efficiency is less than 100% |
| Its parts are weightless, elastic and perfectly smooth. | Its parts are not weightless, elastic or perfectly smooth. |
| There is no loss in energy due to friction. | There is always some loss of energy due to friction. |
| Work output of such a machine is equal to the work input. | Work output is always less than the work input. |
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