We unknowingly used the “Impulse Approximation” in the previous two videos. Now it’s time to know what that means.

During summer vacation, it is very difficult to find time to film Flipping Physics. I need large chunks of time at home with nobody else around. Children make this difficult. It's nice to get back to the school school schedule and be able to film with more regularity!

I recently discovered a Facebook message from a student I never knew I had. She agreed to let me post it verbatim. This is why I spend so much time giving away education for free.

Dear Mr. Palmer,

I just wanted to take a second to thank you SO SO SO much for all your videos online. I am currently taking a physics course at UNC chapel hill and when I started, I got a 60 on my first exam. After finding your videos I started watching them religiously and you have basically been my teacher for this entire course. I am proud to say that so far I am on track for an A in the class thanks to you. I now show up to class completely prepared for whatever topic the teacher is "trying" to teach to us and I would be failing without your videos- I don't know how long it must take you to film, but Billy , Bobby, and Bo's questions have been some of the exact critical mistakes that I was making and that no one took the time to explain to me. My last exam was on SHM and one of the highest point questions was one that stumped everyone because he didn't give us the mass. When I laid out the problem I stared at it for quite awhile until all of a sudden the eye of the tiger started playing in the back of my head once I realized that "Everyone brought mass to the party. " I was so excited and would not have been able to get that 90% ( average was a 60% hehehe) without you!

Thank you for all you do!!!!!!

Cam Dengler