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प्रश्न
Answer the following.
What is a machine?
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उत्तर
Tools and objects that help us to perform the same amount of work with much less effort than if we did the work manually, are called machines.
Example: lever, hammer, knife, etc.
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संबंधित प्रश्न
When is work said to be done by a force?
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
show a nut cracker In the diagram, mark the position of the fulcrum F and the line of action of load L and effort E .
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 an example of the following uses of a machine:
to obtain gain in speed
Define velocity ratio.
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
How does a machine work?
Give an example of the following use of a machine to obtain gain in force.
Name some simple machines.
