Q55 of 100 Page 231

Why do tyres of cars wear out gradually ?

The tyres of the car wear out due to friction produced between he tyres and the car when a car is moving.


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How does a bicycle stop when its brakes are applied ?

 54

Explain why, the soles of our shoes wear out gradually.

 56

State two advantages and two disadvantages of friction.

 57

Explain why, sportsmen use shoes with spikes.