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Give any two effects of a force on a non-rigid body.
Two main effects of a force on non-rigid body are:
i) It can change the state of rest or of motion of the body.
ii) It can change the size or shape of the body.
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Where is the center of gravity of a uniform ring situated?
The center of gravity is situated at the centre of the ring.
The position of the center of gravity of a body remains unchanged even when the body is deformed.’ State whether the statement is true or false.
False.
The centre of gravity id dependent on the shape of the object.
A force is applied on a body of mass 20 kg moving with a velocity of 40 m/s. The body attains a velocity of 50 m/s in 2 seconds. Calculate the work done by the body.
Force = 
Displacement = 
Work done = Force x Displacement
=
W = 
= 
= 9000 J
With reference to their direction of action, how does a centripetal force differ from a centrifugal force.
Centripetal force is directed towards the centre of circle while centrifugal force is opposite to the centripetal force.
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