Centre of Mass

Q.

Two oscillating systems; a simple pendulum and a vertical spring - mass - system have same time period of motion on the surface of the Earth. If both are taken to the moon, then

1. Time period of the simple pendulum will be equal to that of the spring - mass system

2. Time period of the simple pendulum will be more than that of the spring - mass system

3. Time period of the simple pendulum will be less than that of the spring - mass system

4. Nothing can be said definitely without observation

Q.

Differentiate between center of gravity and centroid.

Q. When the net force acting on a rigid body is zero, the centre of mass of the body is moving at a constant .

1. velocity
2. acceleration
3. deceleration

Q.

What do you mean by centre of gravity of a body?

Q. A 20 kg square plate of side 4 m has uniform mass density and is hinged vertically at the midpoint of its side A. The torque about A is . Take $g=10m/s^2$

1. 200 N-m
2. 100 N-m
3. 400 N-m
4. 300 N-m

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

1. True
2. False

Q.

Doesnt that cushioning thing also have something to do with inertia of motion