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प्रश्न
Classify the following as a lever, a pulley and an inclined plane:
Scissors
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उत्तर
Scissors – A lever
संबंधित प्रश्न
What is an ideal machine?
Answer the following in short.
Mention any two methods by which we can take care of machines.
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?
What is the efficiency of an ideal machine?
Give an example of the following use of a machine to change the point of application of the force.
Give an example of the following use of a machine to change the direction of force.
Classify the following as a lever, a pulley and an inclined plane:
A crane
Which machine will you use to do the following work? Write their type.
To hold a papad for roasting it.
Why is this so machines have to be maintained?
