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प्रश्न
Which machine will you use to do the following work? Write their type.
To draw water from a well.
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उत्तर
To draw water from a well, we should use a pulley system or wheel-axle.
संबंधित प्रश्न
Define the term ‘work input’ and ‘work output’ in relation to a machine.
Can a machine be 100% efficient?
Fig. shows a spade. It is being used to lift soil weighing 30N from the ground.
(a) Mark the direction of the least force on the handle necessary to keep the spade balanced.
(b) Calculate the least force on the handle necessary to keep the spade balanced (the weight of the spade is negligible).
(c) If the left hand was move towards the soil on the spade, would the force on the handle necessary to keep the soil balance the greater or less? Give a reason for your answer.
(d) To which class of lever does the spade belong?
Give an example where a machine is used to obtain gain in speed.
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?
Classify the following as a lever, a pulley and an inclined plane:
A slide
Classify the following as a lever, a pulley and an inclined plane:
A knife
Which machine will you use to do the following work? Write their type.
To cut vegetables.
Simple machines usually exchange a larger force to move a heavy object.
