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Friction - Wikipedia
Friction (Frictional Force): Definition, Formula, & Examples
What is Frictional Force? - Definition, Formula, Examples, Equations
Friction | Definition, Types, & Formula | Britannica
Frictional Force: Static and Kinetic Friction - StickMan Physics
6.4: Friction (Part 1) - Physics LibreTexts
Friction - Physics Book - gatech.edu
Khan Academy
6.2 Friction - University Physics Volume 1 - OpenStax
Friction - The Physics Hypertextbook