NEET 2017 Physics question
Which of the following statements are correct? (a) Centre of mass of a body always coincides with the centre of gravity of the body. (b) Centre of mass of a body is the point at which the total gravitational torque on the body is zero (c) A couple on a body produce both translational and rotational motion in a body. (d) Mechanical advantage greater than one means that small effort can be used to lift a large load.
Solution
(a) False. The centre of mass and the centre of gravity coincide only when the gravitational field is uniform over the body (body small compared with the earth); for a very large body, where varies from point to point, they differ. (b) True (for a body in a uniform field): the weights of all the particles produce
See the full step-by-step solution
Create a free account to read the complete working, and practise questions like this in a timed test.
Create a free account