Definition
The force that resists the relative motion between two bodies in contact is called friction.
Advantages
- Enables us to walk freely.
- Piling of objects without slipping
- application of breaks on moving vehicles
- supports ladder against wall.
- One form of energy can be transferred to another.
Disadvantages
- Restricts motion
- Requires extra energy
- Wear and tear of machines
- Affects the lifetime of moving parts.
Methods of increasing friction
- Spreading sand on slippery roads
- Making the footpath or shoe soles rough
- Improving grip to the ground by fitting spikes in sport shoes
Method of reducing friction
- smoothing the surface by polish
- applying lubricants (grease or oil) on moving parts
- using ball bearing in wheels
- designing curvy shape to submarines and jets to reduce friction by air
[…] Advantages and disadvantages of friction […]