2015 #3 Free Response Question - AP Physics 1 - Exam Solution

This Quantitative/Qualitative Translation question also works as a part of the AP Physics C: Mechanics curriculum.

0:00 Intro
0:11 The initial setup
1:00 Part (a) setup
2:11 Part (a) at x = -D
3:07 Part (a) from x = -D to x = 0
4:28 Part (a) from x = 0 to x = 3D
6:39 Part (b)
7:21 Part (b i)
7:50 Part (b ii)
8:33 Part (c)
10:14 Part (d) Question
11:12 Part (d) Answers

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Link to The 2015 AP Physics 1 Free Response Questions

[jacksonburton]

Your teaching is growing on me. One of the lone teachers who are putting up electronic resources for this crazy course. Props to you.

[MANDERSONMOVIES]

Thank you so much for posting these explanations. Big ap test tomorrow and it is so helpful to see practice problems explained. Thank you Mr. P!!!

[tombskater]

I remember reading all the enraged replies on the ApStudent subreddit about this problem. Normies.

[TALKmd]

The intro is great man, it's make's me smile

[hardcoregary]

Just watching some of your videos dude. I'll be taking this course with 3 other AP classes including Calculus. This looks like fun stuff lol 🙂

[tylorbray]

Part C is confusing, could you just say because the spring is compressed twice as far and compression of the spring is squared it will have four times the elastic potential energy, because the friction is the same in both instances and originally the block traveled 3d because the elastic potential energy is 4 times greater it will travel 12d?

[jessicaqian]

hi, sorry i have another question on this video too - why is the slope of the line constant from 0-3D? I thought that the graph would show a curve since theres a constant negative acceleration from the force of friction, thus causing the velocity to decrease as the block travels. This means that kinetic energy would be affected by velocity but not in a linear fashion since KE=1/2mv^2, thus showing a curve. Thanks and sorry if this is confusing.

[diegozablah]

For part c: is it also correct if I compare the elastic potential energies, saying that U2= 4U1, and then say that d2=4d1 because the distance traveled by the block will be proportional to the amount of energy it has?

[katharinabeck]

Hi! I don't understand the graphing part for friction. if w= kf-ki, and it would be -1/2mv^2, so isn't this a parabolic function so it should not be straight? and also why is kinetic energy increase at a decreasing rate? I am not sure how to graph this.

[khoaquach]

Doesn't the potential energy increase from 0 to 3D because 1/2kx^2 increases as amplitude increases and since energy is conserved

[uah]

Are there any ap physics 1 practice exams the college board has released officialy? There isn't enough material for us to practice! (Btw can we request them to release more exams?)

[mariyapurana]

The equations looks complicated... Mr. P, can you give me a suggestion on how to study for the AP Physics 1 exam? I feel like I'm not ready yet even though I'm going back to my old notes and analyzing my process. My teacher told me to buy the Princeton review. Would that help me?

[MS-qgqx]

Why is it that Hooke's Law cannot be used as proof in part D or am i missing something

[cameront.]

Why is the change in mechanical energy=
0-potential spring energy

[katharinabeck]

I don't understand the graphing part of the square function