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प्रश्न
State four ways in which machines are useful to us.
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उत्तर
Machines are useful to us in the following ways:
- In lifting a heavy load by applying less effort.
- In changing the point of application of effort to a convenient point.
- In changing the direction of effort in a convenient direction.
- For obtaining a gain in speed.
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संबंधित प्रश्न
With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for the machine of a given design.
Draw a diagram to show how a single pulley can be used so as to have its ideal M.A= 2.
Name a machine to change the point of application of force ?
State the incorrect statement:
A force of 5 kgf is required to cut a metal sheet. A pair of shears used for cutting the metal sheet has its blades 5 cm long, while its handles is 10 cm long. What effort is needed to cut the sheet?
‘The force needed to push a load up an inclined plane is less than the force needed to lift it directly’ Give a reason.
Give an example for each of the following uses of a machine:
to obtain gain in force,
Work is the application of a ....... through a distance.
Complete the following sentence :
Mechanical advantage = ___________ × velocity ratio
Mention the advantages of using a machine.
