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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.
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
Select the correct alternative:
For an ideal machine, the efficiency is
State if the following statement is true or false. Correct the statement if it is false.
There are four types of simple machines.
Derive the relationship between mechanical advantage, velocity ratio and efficiency of a machine.
State whether the mechanical advantage of an inclined plane is equal to 1, less than 2 or greater than 1?
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 simple machine enables us to lift a load of 10,000 N by the application of an effort of 500 N. However, when the point of application of the effort moves through 2.5 m, the load gets raised through 10 cm only. What are the values of the:
(i) M.A.
(ii) V.R. and
(iii) Efficiency of the machine?
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 crane
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the third order.
Simple machines usually exchange a larger force to move a heavy object.
