NEET | 2017Rotational MotionEasy
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) Central 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 rotation motion in a body
(d) Mechanical advantage greater than one means that small effort can be used to lift a large load
Options
A.
(a) and (b)
B.
(b) and (c)
C.
(c) and (d)
D.
(b) and (d)
Solution
Centre of mass may lie on centre of gravity net torque of gravitational pull is zero about centre of mass.
Mechanical advantage =
Load > Effort
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