Question

Suggest the ways how can we reduce friction in the following cases :- (a) In shafts of motors, axles of vehicles (b) In rubbing surfaces of machine parts.​

Answer 1

Answer:

. POLISHING : When we Polish a surface, it's roughness decreases. The surface becomes smooth and friction gets reduced. We also sometimes rub the surface with a fine sand paper to reduce their unevenness.

2. LUBRICATION : We all know that when a few drops of oil are poured on the hinges of a door, the door moves much more smoothly. Bicycle and motor mechanics use grease between the moving parts of these machines. In all these cases, we want to reduce friction in order to increase efficiency. Oil-like substances, which help to reduce friction when put on a surface, are called lubricants. Lubricants can be liquid, semi liquid, solids.

3.BALL-BEARING: We know that rolling friction is smaller than sliding friction. Sliding can be replaced by rolling , by use of ball bearing so. For example, we use ball bearings in shafts of motors, dynamos, axles of vehicles and so on.

Answer 2

Ways to reduce friction in shafts of motors and axles :

• Lubricants : Use of lubricants is one of the oldest and most efficient way to reduce between the moving parts of a machinery (for examples : shafts and axles).

• Ball-bearings: In cycles and rickshaws, the axles are connected to the spokes structure of wheel using ball-bearings. This is because rolling friction is less than static friction.

Ways to reduce friction in rubbing surfaces:

• Polishing: Polishing helps to remove the small undulations or roughness on the contact surfaces. This helps to prevent wear-tear of the surfaces and increases longevity of the machines.

$\star$ Hope It Helps.