Understanding the Force of Friction Equation

This is an AP Physics 1 topic.

0:00 The basic Force of Friction Equation
0:20 One Kinetic Friction Equation
0:39 The Two Static Friction Equations
1:40 Example Free Body Diagram
2:16 The direction of the Force of Friction
3:20 Determining the magnitude of the Force of Static Friction
4:09 Understanding the “less than or equal” sign
6:08 If the “less than or equal” sign were not there

Next Video:
Experimentally Graphing the Force of Friction

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Previous Video:
Introduction to the Coefficient of Friction

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[chherryflavored]

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[solvedproblemsu]

Nicely done ... I liked the use of the book and the overlay of forces present ... and the socks.

[rocks]

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[ryanbutton]

Awesome video. Explained very nicely and at the perfect pace. Thanks a lot for the awesome physics videos! Keep up the brilliant work.

[waelhosn]

a great video that answers the questions of every student. i did like the fact that you covered the whole chapter of friction, which made it so much easier for me.
 good job and keep it up.

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[margorenee]

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[officialdieselstudios]

Thank you "Flipping Physics" this video has helped me to understand a little better on how to tell the difference between static and Kinetic Friction. Also on how to tell when the two change back and forth.

[lokwhytho]

this saved my life, thank you so much for your thorough explanation!!!

[itsnzsaad]

That was really helpful.
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[fabricea]

This is great! Khan academy is pretty limited when it comes to going into deeper physics concepts and this really helped! thank you.

[mblphysics]

You cannot use the vector sign for these forces. They have different directions, therefore the vectors cannot be equal to each other (just their magnitudes).

[Percules]

You really put a lot of effort into making these videos :) Great job!

Had a question, since you said Static friction is GREATER or MORE than the force of kinetic friction, but why does Static friction become zero?

[aussie]

Quirky and creative.. fantastic video! Thankyou

[vidalizmartinez]

very entertaining and educational! Thanks!!

[Uncertaintycat]

Excellent video as always! However, you have "friction" misspelled in the given URL in the comments, so people can't get to the wonderful lecture notes. :)