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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
State whether the following statement is True or False.
A machine performs work by itself.
Define the term ‘work input’ and ‘work output’ in relation to a machine.
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
Give two examples of inclined plane where it is used to raise a heavy load with less effort ?
Define Efficiency
Give an example where a machine is used to obtain gain in speed.
Give an example of the following use of a machine to change the direction of force.
A uniform metre scale is kept in equilibrium when supported at the 60 cm mark and a mass M is suspended from the 90 cm mark as shown in the figure. State with reasons, whether the weight of the scale is greater than, less than or equal to the weight of mass M.
Why is this so machines have to be maintained?
Rearrange the letters and find out the name of the tool.
R L E V E
| ______ | ______ | ______ | ______ |
