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प्रश्न
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.
पर्याय
True
False
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उत्तर
False.
Work done by a machine is always less than the work done on a machine.
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संबंधित प्रश्न
When is work said to be done by a force?
What is the principle on which a machine works?
Define the term ‘work input’ and ‘work output’ in relation to a machine.
The diagram below shows a wheel barrow. Mark position of fulcrum F and draw arrows to show the directions of load L and effort E. What class of lever is the whell barrow? Give one more example of the same class of lever.
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.
What is the efficiency of an ideal machine?
How does a machine work?
What is a lever?
Why is this so traveller’s bags have wheels?
