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प्रश्न
Can a machine have an efficiency of 100%? Give a reason to support your answer.
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उत्तर
Efficiency of a machine is always less than 100% as output energy is always less than the input energy because some energy is lost to overcome friction.
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संबंधित प्रश्न
The mechanical advantage of an inclined place is always:
(a) less than 1
(b) equal to 1
(c) greater than 1
(d) nothing can be said
Write the relation between mechanical advantage, velocity ratio and efficiency.
Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
How does a machine work?
Classify the following as a lever, a pulley and an inclined plane:
The wheel of a flagpole
Identify and mention the types of simple machines.
 |
 |
 |
| ______ | ______ | _______ |
 |
 |
 |
| ______ | ______ | ______ |
Simple machines usually exchange a larger force to move a heavy object.
Simple machines makes work easier by trading ______ for force.
A pair of scissors is a _____ multiplier.
