Statics: Introduction to Friction, Slipping, and Tipping

EDITS
@ 00:41 I said "static" but meant "kinetic"

In this video we introduce the concepts of Friction, slipping (when we push an object and it slides), and tipping (when we push an objects and it rotates about a point and "tips" over).

In my opinion, this is all the knowledge you need to solve problems from this section. Other books/professors may present the 3 types of Slipping/Tipping problems:
1) No apparent impending motion
2) Impending motion at all points of contact
3) Impending motion at some points of contact

But think these are just more things that you have to memorize, and are not strictly needed. Solving problems from this section require using common sense and imagination, so let's work out some practice problems after you are done with this video!

Practice is the name of the game!

[noyfbnoyfb]

Best video I’ve found to explain why the normal force is used in Frictional Force analysis for non-slippage and slippage conditions.

Thank you.

[Riften]

What a detailed amazing explanation. Thank you!! Love from Nepal.

[patrisio]

Thank you! This helped me understand friction a lot better.

[anakarmelalopez]

Helpful for a quick recap. This is a good refresher. :)

[grffyyn]

Loved the video! A few of my problems had do do with how high or large the force must be to initiate the different reactions, forcing one to use moments when solving these problems. I’d like to see a slightly more complicated video incorporating moments into the process, but I think one could figure those out with the intuition shared in the video, great explanation of concept!

[quentincorbioli]

Great video, this helped me understand how friction acts statically and kinetically ! I was wondering if there was a name for the phenomenon when an object overcomes the max static force but slows down immediately and reaches 0 speed again several consecutive time, like when you push a fridge, there is a kind of vibration phenomenon.

[kevinkinal]

Excellent.. Esp basic knowledge + common sense. Sooo much better then a bunch of equations untethered to reality. I am not a student but I am trying to build a stable workbench that need not have the table top attached to the legs. Solving real world problems requires your approach (basics + common sense) . Thanks again! I am also trying to build objects that wont tip when subjected to "Human scale" forces. For example I am trying to figure out why scaffolding has a 4 to 1 width to height ratio. Could you do a vid on stability as a function of height? (A a what height does a post become unstable ... or how many blocks will result in an unstable tower?. But most importantly, I believe after watching this vid that if I am pushing BELOW the mid point (center of mass) that makes tipping IMPOSSIBLE. Is that correct? (even the mass were secured to the ground with a hinge ... aka if there were a small block preventing slipping)

[mrjabar]

Do applied force be greater than Maximum friction force, in case of tipping? Because the body does not move, please explain it?