Explain how you will determine experimentally the position of centre of gravity for a triangular lamina (or a triangular piece of card board).

Which of the following quantities remains constant in uniform circular motion?

1. Velocity
2. Speed
3. Acceleration
4. Both velocity and speed

The direction of centripetal force is always :

1. along the tangent at that point of the circular path
2. towards the centre
3. outwards from the centre
4. none of the above

Centrifugal force is :

1. a real force
2. the force of reaction of centripetal force
3. a fictitious force
4. directed towards the centre of the circular path