Uploaded September 2026 | Updated September 2026, 2 weeks ago

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This video explains the “normal force” and helps build an intuition about what causes the normal force. It also discusses how to draw basic force diagrams or “free-body diagrams” to represent the forces exerted on an object.

A series of demonstrations are performed and discussed to help build an intuition for how solid surfaces are able to actively push against another object.

See more videos below related to forces and motion…

The Normal Force Explained: youtu.be/HvuAq7iaRHY
How to Draw Basic Force Diagrams: youtu.be/yZsc_UP1mqc
Force Diagrams and Component Forces: youtube.com/watch?v=dlV4S_RrnXo
Force Diagrams on Inclines: youtu.be/bztzzPjgijU
Quantitative Force Diagrams: youtu.be/lJgJUDRyFC8
Exploring Static and Kinetic Friction: youtu.be/u6UNpVP8pZI
Static and Kinetic Friction Examples: youtu.be/goI38uJ1ij8
Symbolic Problem Solving with Friction on Inclines: youtu.be/yyRkk-jrmm0
Finding Acceleration and Tension for a "Modified Atwood's Machine": youtu.be/IZA0nCgAWAE
Symbolic Solutions for Accelerating Systems (3-Object Atwood’s Machine): youtu.be/v57_ytDvgeU

Chapters:
0:00 Introduction
0:20 Force Definition
0:35 Gravity
1:31 Spring Demo
2:25 Meterstick Table Demo
3:25 Laser Demo
4:33 Atomic Model of Solids
5:25 Normal Force Definition
6:02 Force Diagram / “Free-Body Diagram”