This document discusses different types of friction including static friction, sliding friction, fluid friction, and rolling friction. It provides examples of how friction makes movement difficult, wastes energy, heats parts that rub together, and causes wear over time. While friction poses challenges, it also enables crucial functions and is necessary for life.

2. Rubbing your hands together to make
them warm.
Pushing a box across the floor.
Write with a pencil
Playing football.

5. Sliding Friction
Static Friction
Friction between two solid objects that are not moving relative to each other.
Friction that occurs when an object slides over a surface.

6. Fluid Friction
Rolling Friction
Friction that occurs when a round object such as a ball or tire rolls on a flat surface.
Friction between layers within a viscous fluid that are moving relative to each other.

7. Walk and Run Hold your Cup
Drive your Bicycle Apply breaks

8. Hammer your nail
Skiing through on the mountains Swim through water
Climb and Enjoy

9. Grindstone-sharpen a chisel Construction of buildings
Play gamesPaint your walls

11. Makes movement difficult
Excess friction can make it difficult to slide a box across the floor, ride a bicycle or walk
through deep snow.
Lubrication and use of ball bearings reduces friction.

12. Wastes energy
Fuel or energy is being wasted because of the friction.
Cars, airplanes and ships are streamlined to reduce friction.

13. Heats parts
The friction of parts rubbing together creates heat.
Wears things out
Any device that has moving parts can wear out rapidly due to friction.

15. Slip while you run
Skid your bike
No fancy walls
Drown

16. No trekking
No Machines
No Flour

17. Friction – also known as necessary evil
As
Life is impossible without it.