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प्रश्न
What is an ideal machine?
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उत्तर
A machine in which no part of the work done on the machine is wasted is called an ideal or perfect machine. Thus, for an ideal machine, the work output is equal to the work input, i.e., the efficiency of an ideal machine is 1 (or 100 percent).
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संबंधित प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
The diagram below shows a wheel barrow. Mark position of fulcrum F and draw arrows to show the directions of load L and effort E. What class of lever is the whell barrow? Give one more example of the same class of lever.
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
Write an expression for the mechanical advantage of an inclined plane.
Give an example of the following use of a machine to change the direction of force.
Classify the following as a lever, a pulley and an inclined plane:
A slide
Why is this so machines have to be maintained?
Simple machines usually exchange a larger force to move a heavy object.
The idea of a simple machine originated with the Greek philosopher Archimedes.
