Friction
Defenition
Friction is a force that resists the motion of one surface over another. It slows down or stops moving objects.
Main details
Friction happens when two surfaces touch each other.
It can be helpful or unhelpful.
There are different types of friction:
Static friction: Prevents motion (like a book on a table)
Sliding friction: Opposes sliding motion (like a sled on snow)
Rolling friction: Opposes rolling objects (like a ball or wheel)
Fluid friction: Resistance in liquids or gases (like swimming in water or air resistance)
Interesting Points
Friction helps us walk without slipping.
Friction creates heat (like rubbing hands together).
Too much friction slows things down, too little makes slipping easy.
Examples
Shoes on the floor when walking
Car brakes stopping a car
Pencil rubbing on paper
Air slowing down a flying kite
Fun Fact
The rougher the surface, the more friction it creates. But ice is so smooth that it has very little friction, which is why people slip on it! ❄️