Demonstrating the Direction of the Force of Friction (8:52)

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AP Physics 1

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In this physics lesson, we break down how the force of friction always opposes sliding motion, whether it’s static or kinetic friction. Through clear demonstrations, motion tracking, and connections to Newton’s Laws of Motion, you’ll see why only relative motion between surfaces determines the direction of friction. This video covers static friction, kinetic friction, inertial vs non-inertial reference frames, and Newton’s Third Law, helping AP Physics 1 students and anyone learning physics strengthen their understanding of frictional forces.

Chapters:
0:00 Introduction
0:33 Block Only
2:03 Disk on Block
4:15 Reference Frames
6:52 Switching the Direction to Review
7:53 Newton’s Third Law

• Thank you Gerardo Garcia  and the rest of my wonderful Patreon supporters. Please consider supporting me monthly on Patreon!
• Thank you to Christopher Becke, Julie Langenbrunner, and Nicky Goff being my Quality Control Team for this video.

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