Short Answer Questions on Friction for Class 8
Yes, friction always opposes the motion of a body. A wooden surface offers more friction on a body compared to a glass surface.
When brakes are applied, the friction between the brake pads and the rims of the wheels converts the kinetic energy of the moving bicycle into heat energy, causing the rims to become hot.
- Using lubricants (like oil or grease) between moving parts.
- Making surfaces smooth by polishing.
- Using ball bearings or roller bearings.
- Streamlining the shape of objects to reduce air or fluid resistance.
We sprinkle talcum powder on a carrom board to reduce friction, allowing the striker and carrom coins to slide smoothly over the board’s surface.
It is more difficult to pull a boat on the beach because the friction between the boat and the sand is higher than the friction between the boat and the water. Sand provides more frictional resistance to motion as compared to water.
Automobile tyres are made corrugated and rough to increase friction between the tyres and the road surface, which improves grip and traction, especially on slippery or uneven roads.
The bodies of boats, ships, and aeroplanes are made streamlined to reduce fluid friction (air or water resistance). A streamlined shape allows these vehicles to move more smoothly and efficiently through air or water by minimizing drag.
