Friction
Aims:
TBAT describe friction
To know how friction can be reduced
To investigate factors that affect friction
TBAT explain how friction can be useful
If you rub your hands together they get warm. There is resistance to the rubbing motion.
What is the name of this resistive force called?
What causes this force?
Your hands might look smooth, but on a microscopic level they have rough surfaces. So when you rub your hands together you feel the resistive force of friction.
What is friction?
It is called friction.
Friction always tries to slow moving objects down. We say it opposes motion.
There is a maximum value for the frictional force which depends on:
More about friction
Friction is created whenever two touching objects or surfaces move past each other.
Friction also occurs when things move through air. This is called air resistance or drag.
the force pushing the two surfaces together; the state of the surfaces in contact.
One more? Probably the most important…
tyre and road
brake pad and rim
wheel bearingwheel
bearing
pedal bearing
links in chain
air resistance or “drag”
What are the sources of friction?
Friction
1) What is friction?
2) Give 3 examples where it is annoying:
3) Give 3 examples where it is useful:
4) What effect does friction have on the surfaces?
Top Related