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i) Define 1 kgf
ii) How is it related to the S.I. unit of force?
i) 1 kgf is the force with which the earth pulls an object of mass 1 kg towards itself.
ii) 1 kgf = 9.8 N
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i) What are non-contact force?
ii) How does the distance of separation between two bodies affect the magnitude of the non-contact force between them?
i) The forces which are applied from a distance, without actually touching the body is called non-contact forces.
ii) As the distance of separation increases, the magnitude of non-contact forces decreases.
A boy of mass 30 kg is sitting at a distance of 2 m from the middle of as ea-saw. Where should a boy of mass 40 kg sit so as to balance the sea-saw?
Let the boy of mass 40 kg is sitting at a distance of x m from the middle of the see-saw on other side of the boy of mass 30 kg to balance the see-saw.
Now, using principle of moments, 
i) What is meant by the term ‘moment of force’?
ii) If the moment of force is assigned a negative sign then will the turning tendency of the force be clockwise or anti-clockwise?
i) Turning effect of force acting on a body about an axis is called moment of force. It is equal to the product of magnitude of force and the perpendicular distance of the line of action of force from the axis of rotation.
ii) Clockwise.
i) Which of the following remains constant in uniform circular motion: Speed or velocity or both?
ii) Name the force required for uniform circular motion. State its direction.
i) Speed remains constant.
ii) Centripetal force, directed towards the centre of the circle.
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