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Communication of the week:

  • 2019.02.07: "The greatest thing of this video is that this is not just ,,eh you put this and this to the average velocity formula and voila", but instead this video gives an idea of how students should approach, access and get closer to solution. I'm a Junior HS student and a Politics guy, but these videos really made me interested into the field of physics. Keep up the great work!! Love from Korea :)" 고재민 - YouTube Comment
Did you know I teach part-time to allow time to make these Flipping Physics videos? That is because it takes a tremendous amount of time to make videos of high caliber. Yep, I am in the classroom 40% of the time of a full-time teacher. That means I make 40% of the salary a full-time teacher. Can you imagine that? So realize, yes, I provide all the videos for free. This is because there are many people on this planet who cannot afford high quality education like this. However, if you can afford to, especially if you are assigning my videos for students to learn from, please pledge me a few dollars a month on Patreon. If not, there are other ways to help out as well. Thanks.
- Mr.p, Billy, Bobby, Bo.

Most Recent Video (2019.02.10)
2 Masses on a Pulley - Torque Demonstration (13:48)
Example: 0.100 kg and 0.200 kg masses hang from either side of a frictionless #Pulley with a rotational inertia of 0.0137 kg·m^2 and radius of 0.0385 m. (a) What is the #AngularAcceleration of the pulley? (b) What is the #TensionForce in each string? This is an AP Physics 1 Topic.

Content Times:
0:08 The problem
1:29 The free body diagrams
2:51 Net torque on the pulley
4:28 Net forces on both masses
6:49 Tangentail acceleration
7:31 Solving for acceleration
8:55 Measuring acceleration
10:16 Solving for Tension
12:29 2 incorrect solutions
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