(D) Statement $(a)$ is incorrect because the centre of mass coincides with the centre of gravity only if the gravitational field is uniform.Statement

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(D) Statement $(a)$ is incorrect because the centre of mass coincides with the centre of gravity only if the gravitational field is uniform.Statement $(b)$ is correct because the centre of mass is defined as the point where the net gravitational torque acting on the body is zero.Statement $(c)$ is incorrect because a couple produces only rotational motion,not translational motion,as the net force of a couple is zero.Statement $(d)$ is correct because $\text{Mechanical Advantage} = \frac{\text{Load}}{\text{Effort}}$. If $\text{Mechanical Advantage} > 1$,then $\text{Load} > \text{Effort}$,meaning a small effort can lift a large load.Therefore,statements $(b)$ and $(d)$ are correct.

Class 11 Physics System of Particles and Rotational Motion Mix Example - System of Particles and Rotational Motion

Medium

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 produces both translational and rotational motion in a body.
$(d)$ Mechanical advantage greater than $1$ means that small effort can be used to lift a large load.

NEET 2017 All NEET

A
$(a)$ and $(b)$
B
$(b)$ and $(c)$
C
$(c)$ and $(d)$
D
$(b)$ and $(d)$

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System of Particles and Rotational Motion

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Mix Example - System of Particles and Rotational Motion

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