How To Solve Simple Harmonic Motion Problems In Physics

[@TheOrganicChemistryTutor]

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I’m here the night before my AP Physics 1 exam 2020. Anyone else?

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me

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Nah, just trying to pass college physics now 😭

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Thank you so much for making things so much simpler than how profs explain...these things go over my head in class but doing these problems with you really boosts my confidence!

[@zo0m524]

do you know what class this is at your university if you're still there? we are learning this +more in our high school physics class so im wondering if ill have to learn the same thing again later

[@rebeccaly]

@@zo0m524 I was learning this material in my general physics class. I only had one physics class in college. Hope this helps!! Good luck with your studies :)

[@Andrew-fb8ph]

@@zo0m524 AP classes cover introductory college class content. So what you're learning in AP physics is likely similar to what a college freshman is learning in their physics class. Depending on how well you score on ur AP test, and which school you commit to, you may be allowed to skip a physics class in college.

[@NebulaEntertainment.]

@@zo0m524 It's normal to learn physics in high school, in mine it's mandatory to take it if you want to graduate but some will allow you to skip. In college, it's usually gonna just be the low-level physics where it just goes over the main important stuff about physics. I'm graduating in a few days and going to be majoring in physics and while I was talking with my advisor about what classes to take to get the degree, the first physics class is basically almost everything I covered this year in physics.

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@@Andrew-fb8ph its not even AP physics though this is our honors class, our AP class is way way harder

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[@puddleduck1405]

Thank you, this was so helpful!! Also a quicker way for the last question is to use the formula T = 2 pi * square root of (m/k), and just rearrange for k since we have the other variables

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[@robertslayerofmonsters1302]

This is a nice set of practice problems! However, the statement of Problem 3, should specify that the mass is the same in the two scenarios. Otherwise, if the mass is not the same, the cancelling method would not work. You can also use a method to find the mass itself in Scenario 1, it's 4.05x10^-3, and then plug it into Scenario 2 to find the frequency.

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[@zackgrey4472]

For the second question, should Force = - k * x or Force = k * x? I've seen negative for SHM but noticed you just left it positive so I'm not sure

[@robertnagy3942]

the minus sign is only required if you write the vector form of the equation, because the force vector is always pointing towards the equilibrium. In most equations you only care about the intensity of the force, not the direction, so you can leave the minus sign and just use F = kx

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[@PandemoniumVice]

3:48 Okay, I'm having difficulty finding the Spring Constant in a problem I'm working on. All I'm given is the mass (m=10kg) and the frequency (f=4 Hz) in a vertical simple harmonic oscillation. I need to find the frequency when the mass is 85 kg. How do I find k from here if I don't know x? Or I guess how do I find x from the weight and frequency? The only force acting on the object is gravity.

[@micheekashale3858]

When m= 85kg f= 1,372 Hz Using same K= 6316,55N/m (drawn from the formula of frequency with the first given coordinates of m=10kg, f=4Hz ) Then use the same K found to substitute in the equation with the new mass of 85kg to find the frequency.

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Yeahhh,because k is a constant,so you only need the mass and the initial frequency and the final one

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At 5:42, why do we get to assume that the mass of the two springs is the same? If the second spring had a mass 4 times the mass of the first spring, wouldn't the frequencies be the same?

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You really helped me solve these harmonic quiz thank you very much.

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[@Sarahh_]

can you make one on how to find phase, and speed point using this equation?

[@techinfo5145]

we can easily calculate t=2pi*root(m/k) and finally value of k

[@nonyabizness577]

@11:05 - 11.55Hz for frequency?

[@treywilliams3447]

That what i am getting, he probably miss calculated

[@Khomeini_N.S.E]

It's correct guys, 1/1.17 =0.85

[@shaneclark4479]

For question 1 part b I got f = 31.4Hz I did this with the eq. (1/2pi)(sqrt(k/m)) How do you know which equation to use? Because they both give different answers

[@MAXYANKEE5]

Your equation is correct. You probably are making a calculation error. 300/0.75 = 400 sqrt of 400 = 20 20/6.28 = 3.18 Hz

[@jacobwaldrop6466]

@@MAXYANKEE5 where did you get the 6.8 from? (1/2pi) is 1.57 and 1.57x20=31.4

[@DanyealBeckman]

How did you determine the formula for frequency, I noticed that the formula was different from example one than it was in example 2. F= 1/T vs Example 2, F= 1/2pie [K/m]

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4:01 where in the formula sheet is this equation

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can we put a(acceleration) in the formula instead of g(gravity) in the simple pendulum?

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kinda confused by the second question. shouldn't k=-f/x?

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Negative is not considered