AP Physics 1 - 2020 Exam Sample Questions Full Solution

AP Physics 1 - 2020 Exam Sample Questions Full Solution
Link To Question

Consider Showing Some Love On Venmo @TheFinnMindset

A small sphere of mass M is suspended by a string of length L. The sphere is made to move in a horizontal circle of radius R at a constant speed, as shown above. The center of the circle is labeled point C, and the string makes angle θ0 with the vertical

Two students are discussing the motion of the sphere and make the following statements.
Student 1: None of the forces exerted on the sphere are in the direction of point C, the center of the circular path. Therefore, I don’t see how there can be a centripetal force exerted on the sphere to make it move in a circle.

Student 2: I see another problem. The tension force exerted by the string is at an angle from the vertical. Therefore, its vertical component must be less than the weight Mg of the sphere. That means the net force on the sphere has a downward vertical component, and the sphere should move downward as well as moving around in a circle.

(a) What is one aspect of Student 1’s reasoning that is incorrect? Explain why.
(b) What is one aspect of Student 2’s reasoning that is incorrect? Explain why.

Student 3 correctly derives two equations to relate the tension force FT to the net force Fnet and the other quantities.
(c) Explain how one of the equations can be used to challenge Student 1’s claim.
(d) Explain how one of the equations can be used to challenge Student 2’s claim.

The students observe that the radius R increases as the speed v of the sphere increases. Together, they derive the equation R = v L/g to calculate the radius of the circle R followed by the sphere if its speed is v.
(e) Regardless of whether this equation is correct or incorrect, does it plausibly model the students’ observation about the relationship between R and v? Why or why not?
(f) This equation does not correctly model the relationship between R and v if v is very fast. Explain why.

Instead of moving in a horizontal circle, the sphere now moves in a vertical plane so that it is a simple pendulum, as shown above. The maximum angle θmax that the string makes from the vertical can be assumed to be small. The graph below shows data for the square of the pendulum period T as a function of string length L.

Explain how the above graph would change under each of the following circumstances. Justify your answers.
(g) The mass of the sphere is increased.
(h) The maximum angle θmax is decreased.
(i) The pendulum is taken to the Moon.


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[themathandphysicstutor]

*Please give this video a THUMBS UP if you want me to make more solution videos!*

[hannaassefa]

I’m legit going to fail. All we ever did in class was plug in numbers. I don’t even remember us deriving equations.

[burhanchughtai]

Him: "and because of this we know that...."
Me: do?"

[edwardreagan]

who is here starting their studying for the exam tm

[wilsonchen]

Exam in 3 hours. Let’s hope for the best fellas

[Mario-ycen]

test is today, first half of the year the teacher wasnt there and the second half we didnt go to school. nice

[jillhughes]

pov the ap is in 15 hours and you just started studying

[ArcticProxy]

Thank you so much. This is gonna be rough for me but I'm not stressing. Life will be the same regardless :)

[darrennguyen]

Would you recommend handwriting or typing our response for the AP Physics 1 test this year?

[kshah]

Either I'm stupid or at 6:53 you said cos theta = O/H?

[ArcG]

WOO GOOD LUCK TOMORROW BOOYSSS (AND GIRLS)

[noahkerr]

for j), would the slope be ω, or angular velocity instead of normal velocity because the axis are θ in the y and s in the x?
13:07

[sofam]

Around 7:05 you say cos is opposite/hypotenuse, you do the problem correctly but it's a bit confusing with the mixup

[danielnguyen]

wow I just found your channel, and I really appreciate your videos, explanations and help that it's giving me

[rogueorangeindustries]

Who's here studying bf the exam today😩

[arunsinghal]

Thanks for your video. In my class we mostly did calculations and few sentence answers. How do you know when sentence answers are appropriate/required on this year's AP exams?

[ananyaanair]

For part e at 7:55, would it suffice to say yes, because v is in the numerator, making R and v directly proportional? I forgot to include that L and g are constants. Is that as much of an important factor when reasoning or would my statement be enough?

[_isbored]

Oh my gosh you are saving me!! I just have a question in 14:55; I don't understand why the torque would go clockwise.. is it because r is to the left of the Fg?

[sinbadk.]

For the very last question. Doesn’t the force of gravity have to act at some radius r, not at the center, in order to extern a net toque on the sphere. Since torque = Frsintheta, If r is zero, no torque would be present

[kitkat]

I appreciate your videos so much!! I only found your channel recently but your explanations and process are clear and very helpful. Thank you!!