AP Physics 1 Exam 2018 Free Response Solution #3

Link To question:
The disk shown above spins about the axle at its center. A student’s experiments reveal that, while the disk is spinning, friction between the axle and the disk exerts a constant torque on the disk.

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[JuanGarcia-uczm]

Thank you, this is so helpful. Could you do a video on the College Board problem, I just can’t get my head around it. “a student hangs a 0.125 kg object on a spring, sets it into oscillation, and obtains the data for the position and velocity of the object as a function of time shown in the graphs below”. Thank you!

[matt]

for the graph of w in part c, after 1=(1/2)t would the decrease be more parabolic than linear?

[shibletking]

Wouldn’t it be I=w/torque •t for part b? my thought process is torque= I(w/t) then divide by I to get torque/I=w/t then multiply both sides by 1/torque to cancel out torque on the left side which would equal I=w/torque•t

[alecdegraaf]

Thank you so much for the videos. How do you know momentum is conserved in part b?

[matthew-r]

In part b, could you leave the negative sign in the answer, if we sub "-w/t" in for alpha?

[babettegilles]

Thanks! But for part cii, wouldn't the value of acceleration be constant after (1/2)t since the angular velocity in that time is linear and not curved?