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प्रश्न
What is a lever?
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उत्तर
A lever is a simple machine consisting of a rigid rod that is capable of turning around a pivot called a fulcrum. It has three parts, namely effort, load, and fulcrum.
- Fulcrum: The rod of the lever rests on it and the lever rotates about it.
- Load: The weight lifted by the liver is called the load.
- Effort: The force applied on the other end of the rod to lift the load is called the effort.
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संबंधित प्रश्न
State whether the following statement is True or False.
In an ideal machine, work done on load is equal to the work done by effort.
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
Why is a machine not 100% efficient?
State whether the mechanical advantage of an inclined plane is equal to 1, less than 2 or greater than 1?
Can a machine be 100% efficient?
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.
Give an example of the following use of a machine to change the point of application of the force.
Classify the following as a lever, a pulley and an inclined plane:
A wedge
Classify the following as a lever, a pulley and an inclined plane:
A staircase
Classify the following as a lever, a pulley and an inclined plane:
A crane
