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प्रश्न
Answer the following.
What is a machine?
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उत्तर
Tools and objects that help us to perform the same amount of work with much less effort than if we did the work manually, are called machines.
Example: lever, hammer, knife, etc.
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संबंधित प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
Answer the following in short.
Mention any two methods by which we can take care of machines.
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?
Can a simple machine act as a force multiplier and a speed multiplier at the same time?
What is the efficiency of an ideal machine?
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
Classify the following as a lever, a pulley and an inclined plane:
A slide
What is a lever?
Simple machines usually exchange a larger force to move a heavy object.
The idea of a simple machine originated with the Greek philosopher Archimedes.
