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प्रश्न
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
पर्याय
True
False
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उत्तर
False.
There are six types of simple machines.
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संबंधित प्रश्न
State whether the following statement is True or False.
In an ideal machine, work done on load is equal to the work done by effort.
Name six simple machines. Give an example of each machine.
Answer the following.
What is a machine?
Why is a machine not 100% efficient?
State the kind of lever which always has mechanical advantage less than 1. Draw a labelled diagram of such a lever.
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?
A uniform metre scale is kept in equilibrium when supported at the 60 cm mark and a mass M is suspended from the 90 cm mark as shown in the figure. State with reasons, whether the weight of the scale is greater than, less than or equal to the weight of mass M.
Classify the following as a lever, a pulley and an inclined plane:
A wedge
Classify the following as a lever, a pulley and an inclined plane:
A staircase
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the third order.
