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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
Can a machine have an efficiency of 100%? Give a reason to support your answer.
Answer the following.
What do you understand by a complex machine?
Define Simple machine
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?
Define mechanical advantage (M.A.) of the machine.
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:
An opener
Which machine will you use to do the following work? Write their type.
To remove the lid of a tin.
Why is this so traveller’s bags have wheels?
______ help us to make work easier.
