2018 AP Physics C Mechanics FRQ 1

Let's test our knowledge of kinematics.
I would like to thank Mr. P, my outstanding AP Physics C teacher, for taking his time to kindly check my work.

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[youknowwhatsreallysofunny]

Interesting to see SI units on an american exam.

[cicciobombo]

7:35 what you mean pretty close? That's actually the exact value of g for engineers

[cicaleapchem]

Your videos/explanations are excellent. Can you please continue to make a playlist of AP Physics C solutions for both mechanics and electricity/magnetism? Thank you!

[Makabaril]

I went through nearly this entire problem knowing what to do without being in C and it feels awesome

[floscha]

As question e)iv. states one should assume that the ball starts at the height 1.4m which means C = 1.4m instead of 0.08m as given below. The height you would need to set it equal to to get the time is the height of the pad defined as h=0m. Therefore the quadratic that has to be solved for time is 0 = 5.75 t^2 - 0.524 t + 1.4

[jilow]

He's definitely a mathematician first.

For example on making "g" be the slope of the line. It would not have been my first instinct to modify the x-axis to be some strange value.

Instead I would have put time on the X-axis and velocity as the Y-axis and note that velocity will increase linearly as a rate of "g." It'd have been more work but it'd have some real meaning in the context of what we see around us in reality.

I do like your videos and I think you make my math better.

[darshandesai]

Why is 1/2 t^2 used for the x axis instead of just t^2?

[Jx]

the axes are switched, Independent is height, depending is time^2.

[loganbowers]

e iv. is a terrible question. The part clearly states that the sphere is at a height of 1.40 m at t = 0. Meaning that the CHANGE IN y from t = 0 to whenever it hits the ground should be 1.40 m. Both the scoring guidelines and this video make it out to be that the sphere only travels 1.32 m from t = 0 to the bottom, which makes absolutely no sense if it is at 1.40 m at t = 0.

[neuro]

Oh cool, you are doing AP Physics too!

I can't remember my answers but I'm pretty sure I got all of them, it was fairly straight forward. Although on a side note, when taking the test I accidentally flipped two pages instead of one when opening it and started on part e without even thinking. I didn't realize until part iv of e that there was more as I didn't even notice that I was on e. ahahaha

Will you be doing the electricity and magnetism FRQs also?

[atharvaprajapati]

At first I thought u were a mathematician but now physics as well

[areeb]

Aghh I did everything right except the last part. I just used actual value of gravity and said v=√2×9.81×1.4