Physics › Section C · Forces and Newton's laws › Topic C.1
Force and Newton's first law
Why does a rolling ball eventually stop, while a space probe keeps coasting for decades? Newton's first law answers both: motion itself needs no force, but every change in motion does.
In this topic
- What a force is
- Kinds of force and how to measure them
- Adding forces: the net force
- Free-body diagrams
- Worked example: two ropes on a sledge
- Newton's first law
- From Aristotle to Galileo
- Inertia and mass
- Inertial frames of reference
- Worked example: is the net force zero?
- Common mistakes to avoid
- Key takeaways
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