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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?
Name six simple machines. Give an example of each machine.
State if the following statement is true or false. Correct the statement if it is false.
Work done by a machine is always more than the work done on a machine.
What is an ideal machine?
Give an example of the following uses of a machine:
to obtain gain in speed
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
Define mechanical advantage (M.A.) of the machine.
Classify the following as a lever, a pulley and an inclined plane:
An axe
Classify the following as a lever, a pulley and an inclined plane:
A crane
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.
