13. (a) If we look around, we will find vehicles, moving on road are of variety shapes and designs. These are not to make the car beautiful but also reduce the effect of air friction whon they move on the roads. Racing cars, which have to move really fat, are given a special shape to overcome the force of friction.
(a) What is friction?
(b) ln which category frictional force is included between contact and non contact force? Give reason
(c) How is frictional force differ from gravitational force?
(d) Name the special shape that is given to racing car to reduce effect of frictional force on it.
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Non-contact force occurs due to either attraction or repulsion between two objects such that there is no contact between these objects. There is no field linked with the contact force. There is always a field linked with non-contact force. The frictional force is an example of a contact force.
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