(b)Give 2 examples that friction is necessary for everyday activities
(c)Write 2 examples where sliding friction is replaced by rolling friction
(d)Give reason for the following
(i)Kabaddi players rub their hands with mud beforeplaying.
(ii)It is difficult to walk on wet floor
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ii ans examples of friction in our daily life
Driving of a a vehicle on a surface.
Applying brakes to stop a moving vehicle.
Skating.
Walking on the road.
Writing on notebook/ blackboard.
Flying of aeroplanes.
Drilling a nail into wall.
Sliding on a garden slide.
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Explanation:
iii ans In circular object sliding friction is usually replaced by rolling friction because that helps in movement of the object. Explanation: for example in the tyres of a car the sliding friction is replaced by rolling friction.
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