Question

20. (a) Tyres are provided with irregular projections over their surf-
(b) Explain why curved roads are generally banked?
© How newton third law of motion helps us in walking ?

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Answer 1

Answer:

Explanation: Irreular projections over the surface of automobile tyres increase the force of friction between the tyres and the road .

PLS MARK IT AS BRAINLIEST

Answer 2

Answer:

a) To avoid the slipping of automobiles there should be some minimum friction between the tyres and road. Therefore, to increase the friction, irregular projections are made on the surface of tyres.

b) On a banked road, the resultant of the normal reaction and the gravitational force can act as the necessary centripetal force. Thus, every car can be safely driven on such a banked curve at certain optimum speed, without depending on friction. Hence, a road should be properly banked at a bend.

c) Newton's third law states that every action has an equal and opposite reaction. This is relevant to walking because when you put your foot on the ground, you are applying a force to it. In doing this, the ground also actually applies an equal force onto your foot, in the opposite direction, pushing you forward.