Question

Friction should be reduced as much as possible in __________ .

a. the brakes
b. the engine
c. the tires

Answer 1

Friction should be reduced as much as possible in the engine.

Answer: B

Step-by-step explanation

Friction is defined as the force which resists the motion of an object on the surface of other object.

Friction acts on the surface of both the objects in contacts. It is termed as a resisting force towards the motion of an object.

The frictional force is used in brakes to convert the kinetic energy of tires into heat energy so that the motion of tire can be stopped on applying brakes.

Similarly the frictional force in tires are used to keep the vehicle at rest in sliding or hilly regions.

The sliding frictional force between the tires and the surface of roads will help to keep the vehicles at rest in hilly regions.

But the frictional force should be minimized in engines as the frictional force generate heat which may tear the parts of the engine.

So lubricants are used for smooth movement of parts of the engine reducing the friction.

Answer 2

I believe the answer is The engine.
This is because both brakes and tires depends on friction to operate.
Friction is created when two surfaces rub together; for example when a vehicle tires moves over the road surface. Friction can create heat and smoke can often be seen coming from the tires of a racing cars. To stop a car, the brakes have to get rid of kinetic energy. They do so by using force of friction to convert the kinetic energy into heat.