Selina Concise Physics Class 10 ICSE Solutions Machines Selina ICSE Solutions for Class 10 Physics Chapter 3 Machines Exercise 3(A) 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. 2.State four ways in which machines are useful to us? Solution 2. Machines are useful to us in the following ways: In lifting a heavy load by applying a less effort. In changing the point of application of effort to a convenient point. In changing the direction of effort to a convenient dire...
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