2018 #1 Free Response Question - AP Physics 1 - Exam Solution

This Short Answer question also works as a part of the AP Physics C: Mechanics curriculum.

0:00 Intro
0:13 Part (a)
2:28 Part (b) i
6:16 Part (b) ii
7:32 Part (c)

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[joshuawilliams]

This video came out SO great! Wonderful job. I absolutely love how you incorporated the Fg = mg part, and the conservation of angular momentum explanation. I think these, plus the grading explanations, really provide a thorough dive into the concepts and point earning instead of just seeing the “correct answer”. This will be a fantastic review! Nice Superman Billy!

[johnjaesung]

Thank you very much. My school physics teacher also recommended your channel for me (actually I have been watching your video before she told me Flippingphysics)

[diannsloan]

Looks good! I like the addition you made in part c and explanation.

[JWheadset]

5:13 It looks like Billy just derived Kepler’s Third Law of Planetary Motion on the AP Physics 1 exam!

[AyalaMrC]

Great episode! The only nit-picky issue, is m sub E is used instead of M sub E. Need to ask a grader if that is substantial enough of a difference to cost a point. I'll go ask in the facebook group.

[KTBWorld]

Lovely video, as usual. I remember seeing this problem for the first time over a year ago. Personally, I believe this is one of the harder examples of the "derive an equation" problem - a lot of steps and substitutions are required before the connection to period becomes obvious.

[cate]

thank you for the great video! i always wonder why my seemingly correct answers are wrong 😭 but also, got full points on this one 😎

[MJ-hmsn]

Hey... Can you please do something for AP physics c

[ndresC]

no one gonna point out how the mad lad dabs at 4:07?

[zhgshdbssss]

Can I write T = 2*pi*R*the square root of R/GM(earth) instead of bringing everything under the root like you have? That is technically the same thing.Great video though!!

[jacobhthomas]

How’d u guys comment before it was released?👀