Friction is a force that slows things down. It occurs when two surfaces rub against each other. Different types of surface produce different amounts of friction. Smooth surfaces, such as ice, do not create much friction, so things slide over them easily. Rough surfaces, such as roads, produce a lot of friction. This helps car wheels to grip the road, and allows cars to stop easily.
Super friction
If the pages of two books are interleaved, it is almost impossible to pull them apart. This is because there are hundreds of pages, and therefore hundreds of surfaces, that are trying to slide against each other at the same time. This produces an enormous amount of friction, which stops the pages being pulled apart.
Sliding race
Four metal bobsleighs are held at the top of a slope. Each slope has a different surface. Bobsleighs are let go of at the same time.
Slippery surface
A smooth surface, such as this slope covered in oil, creates hardly any friction. Objects slide very easily and quickly along them. Ice skaters and skiers make use of slippery surfaces.
Wooden floorboards
Floorboards are fairly smooth, producing only a little friction, which allows objects to slide over them quite easily. This is why you can sometimes slide on floorboards in your socks.
Scratchy sandpaper
Sandpaper is rough and so creates quite a lot of friction. This means that an object sliding over sandpaper will slow down and stop more quickly than an object sliding over a smoother surface.
Green grass
A very rough surface like grass produce lots of friction, causing an object sliding over it to slow down a lot. The longer the grass, the more quickly the object will slow down.
Picture Credit : Google
