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प्रश्न
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.
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उत्तर
Levers mentioned in the passage are:
- Sea-saw: It is a first-order lever.
- Wheelbarrow: It is a second-order lever.
- Lemon squeezer: It is a third-order lever.
- Tongs: It is a fourth-order lever.
संबंधित प्रश्न
Fill in the blank:
The useful work done by an actual machine is always ............ than the work done on the machine.
What is an inclined plane?
Write the relation between mechanical advantage, velocity ratio and efficiency.
Can a machine be 100% efficient?
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?
How does a machine work?
Give an example of the following use of a machine to obtain gain in force.
Classify the following as a lever, a pulley and an inclined plane:
Scissors
Classify the following as a lever, a pulley and an inclined plane:
An axe
Classify the following as a lever, a pulley and an inclined plane:
A knife
