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प्रश्न
Which machine will you use to do the following work? Write their type.
To lift bricks to the top of a tall building.
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उत्तर
To lift bricks to the top of a tall building, we should use a crane, which is a pulley.
संबंधित प्रश्न
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
Why is a machine not 100% efficient?
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
State whether the mechanical advantage of an inclined plane is equal to 1, less than 2 or greater than 1?
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 relationship between the mechanical advantage and the velocity ratio for:
(i) An ideal machine,
(ii) A practical machine.
Classify the following as a lever, a pulley and an inclined plane:
The wheel of a flagpole
Which machine will you use to do the following work? Write their type.
To hold a papad for roasting it.
What is meant by simple machines?
A pair of scissors is a _____ multiplier.
