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प्रश्न
Classify the following as a lever, a pulley and an inclined plane:
A knife
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उत्तर
A knife – An inclined plane
संबंधित प्रश्न
Name six simple machines. Give an example of each machine.
Define the term ‘work input’ and ‘work output’ in relation to a machine.
Can a machine have an efficiency of 100%? Give a reason to support your answer.
Give a reason for the following.
Machines are able to make our work convenient.
Why is a machine not 100% efficient?
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
Write an expression for the mechanical advantage of an inclined plane.
A cook used a ‘fire tong pair’ of length 32 cm. to lift a piece of burning coal of mass 500 g. If he applies his effort at a distance of 8 cm from the fulcrum, what is his effort? Assume friction etc. to be absent. Also, obtain values of the M.A. and the V.R. of this ‘machine’.
A simple machine enables us to lift a load of 10,000 N by the application of an effort of 500 N. However, when the point of application of the effort moves through 2.5 m, the load gets raised through 10 cm only. What are the values of the:
(i) M.A.
(ii) V.R. and
(iii) Efficiency of the machine?
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.
