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प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
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उत्तर
The useful work done by an actual machine is always less than the work done on the machine.
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संबंधित प्रश्न
State whether the following statement is True or False.
A machine performs work by itself.
What is the principle on which a machine works?
Write an expression to show the relationship between mechanical advantage, velocity ratio, and efficiency for a simple machine.
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.
A cook used a ‘fire tong pair’ of length 32 cm. to lift a piece of burning coal of mass 500 g. If he applies his effort at a distance of 8 cm from the fulcrum, what is his effort? Assume friction etc. to be absent. Also, obtain values of the M.A. and the V.R. of this ‘machine’.
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 draw water from a well.
Why is this so traveller’s bags have wheels?
Name the levers mentioned in the following passage. Identify the fulcrum, load, and effort of each and say which type of lever it is.
Ravi and Savita sit on a seesaw in a garden. In the meantime, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs.
Simple machines usually exchange a larger force to move a heavy object.
