Author: Khan Academy via YouTube
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A force is a push or pull. There are several types, including: applied (from person or machine), tension (from string or cable), gravity (between masses), normal (perpendicular to surface), friction (moving across a surface), thrust (from pushing something the other way), drag (resistance from air or other fluid), buoyancy (from displacing a fluid), and lift (on wings moving through air).

Sections:
00:00 – Intro
00:20 – Applied force and tension
01:15 – Gravity and normal force
02:40 – Friction
03:41 – Thrust
04:29 – Drag force (air resistance)
05:40 – Buoyant force
07:25 – Lift
08:50 – Summary

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