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  • Teach physics to as many people as possible.
  • Make physics education fun and real.
  • Provide free lecture videos for teachers to help flip their students' learning.

Communication of the week:

  • 2019.04.08: "this is very helpful for visualizing the basic relationship between the two, having an actual movie in your head is worth a thousand pages, thanks v much." Luke Nilsen - 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 (2019.04.14)
Merry-Go-Round - Conservation of Angular Momentum Problem (10:31)
A 25 kg child is sitting on the edge of a #merry-go-round. The merry-go-round has a mass of 255 kg and is rotating at 2.0 radians per second. The child crawls to the middle of the merry-go-round. What is the final angular speed of the merry-go-round? You may make the following estimations: The child is a point particle; the merry-go-round is a solid disk and has an axle with negligible friction. This is an AP Physics 1 Topic.

Content Times:
0:07 Translating the problem from words to physics.
1:32 Why the angular momentum of the system is conserved.
3:21 Using the equations for angular momentum and rotational inertia.
4:22 Substituting in equations and variables to solve the problem.
6:06 Understanding why the angular velocity of the system increased.
7:44 Finding the change in kinetic energy of the system.
8:55 Understanding why the change in kinetic energy is positive.
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  • Thank you Scott Carter, Cameron Vongsawan, and Christopher Becke for being my Quality Control team for this video.​