Intro to forces (part 1) | Physics | Khan Academy
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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