Physics › Section C · Forces and Newton's laws › Topic C.6
Friction
Friction is why a heavy sofa refuses to budge, why a car can stop, and why you can walk at all. Two simple models, one for surfaces at rest and one for surfaces sliding, let you put it into Newton's laws.
In this topic
- A force along the surface
- Where friction comes from
- Static friction is an inequality
- Kinetic friction
- Typical coefficients
- Worked example: starting and keeping a crate moving
- Friction on a slope
- Worked example: a box on a ramp
- Worked example: braking on dry and wet roads
- Common mistakes to avoid
- Key takeaways
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