2. The value of MA is always less than 1 in third class lever. Why? ? In a lever, a load of 600N is lifted by using 400N effort. If the load is at the distance of the effort at the distance of 40 cm from the fulcrum, calculate its efficiency
Answers
Explanation:
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Physics
Machines
SELINA Solutions for Class 10 Physics Chapter 3 - Machines
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Chapter 3 - Machines
Page / Exercise
Ex. 3A Ex. 3B
Chapter 3 - Machines Exercise Ex. 3A
Question 1
(a) What do you understand by a simple machine?
(b) State the principle of an ideal machine.
Solution 1
(a) A machine is a device by which we can either overcome a large resistive force at some point by applying a small force at a convenient point and in a desired direction or by which we can obtain a gain in the speed.
(b) An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.