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प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
What do you understand by a machine?
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
Give a reason for the following.
Machines are able to make our work convenient.
Define Mechanical advantage
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.
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
What is the relationship between the mechanical advantage and the velocity ratio for:
(i) An ideal machine,
(ii) A practical machine.
Which machine will you use to do the following work? Write their type.
To draw water from a well.
What is a lever?
