Factors affecting friction

3 (e) discuss the effect of friction on the motion of a vehicle in the context of tire surface, road  conditions (including skidding), braking force, braking distance, thinking distance and stopping distance

I already covered how friction opposes movement, and how it slows down the movement of a body by providing resistance. We will now go more into detail about friction, and how different factors affect friction.

First we need to be aware of a few terms.

Braking distance

 Braking distance is the distance covered by the car while the brakes are being applied. Don't know what to write in this one. maybe if the breaking distance is more, than the friction is lesser compared to a shorter braking distance?


Thinking distance 

Thinking distance is the distance covered by the moving body, during which the driver decides to apply the brake. It is also known as the reaction distance

Stopping distance

This distance includes the thinking distance as well as the braking distance.

Now, let us come to the factors that affect friction

Tire surface

If the surface of the tire is smooth, there would be less friction, as a rough surface always increases friction. Usually old and worn out tires have smooth surface, which results in a longer distance covered when applying the brakes. Furthermore, if there are treads or tracks on the tire surface, there would be more friction.

Road Conditions

If the road is wet or slippery, there would be less friction. On the other hand, there would be more friction on a dry road.

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