Question

Which of the following statements are correct?

Options

• Centre of mass of a body always coincides with the centre of gravity of the body.

• Centre of mass of a body is the point at which the total gravitational torque on the body is zero.

• A couple on a body produce both translational and rotational motion in a body.

• Mechanical advantage greater than one means that small effort can be used to lift a large load.

Answer 1

Centre of mass of a body always coincides with the centre of gravity of the body.

Explanation:

a. A body's centre of mass and centre of gravity may not always be the same.

c. A coupling on a body creates motion that is only rotational.

Only (b) and (d) are therefore accurate.