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प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
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उत्तर
The useful work done by an actual machine is always less than the work done on the machine.
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संबंधित प्रश्न
State whether the following statement is True or False.
A boy does work while pushing a wall.
State whether the following statement is True or False.
A machine performs work by itself.
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Define efficiency.
What is the efficiency of an ideal machine?
How does a machine work?
Classify the following as a lever, a pulley and an inclined plane:
An axe
Which machine will you use to do the following work? Write their type.
To remove the lid of a tin.
Name a machine for each of the following uses:
- to multiply the force,
- to change the point of application of force,
- to change the direction of force,
- to obtain the gain in speed.
A pair of scissors is a _____ multiplier.
