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# Simple harmonic motion watch

1. I'm struggling with an mcq question here. Could anyone tell me why the maximum velocity is pi m/s? Urgent please. Thanks
2. (Original post by Ridah)

I'm struggling with an mcq question here. Could anyone tell me why the maximum velocity is pi m/s? Urgent please. Thanks
They've swapped the labelling for the axes, BTW, but ... the magnitude of the max velocity for SHM is:

so just read the appropriate numbers off the graph, and plug them in.
3. (Original post by Ridah)

I'm struggling with an mcq question here. Could anyone tell me why the maximum velocity is pi m/s? Urgent please. Thanks
From the graph which is maximum precisely when and .
4. (Original post by Zacken)
From the graph which is maximum precisely when and .
Where are you getting these numbers from? They don't look right to me.
5. (Original post by atsruser)
Where are you getting these numbers from? They don't look right to me.
What's your and ? I mostly hazarded a guess from the axes, the amplitude looked like and the period like - I didn't see your answer before posting mine, whoops.
6. (Original post by Zacken)
What's your and ? I mostly hazarded a guess from the axes, the amplitude looked like and the period like - I didn't see your answer before posting mine, whoops.
The 'period''s definitely 3m. I'd guess the 'amplitude' is 1.5s
7. (Original post by Alexion)
The 'period''s definitely 3m. I'd guess the 'amplitude' is 1.5s
Huh? The axes should be swapped, no?
8. (Original post by Zacken)
Huh? The axes should be swapped, no?
Yeah it's real confusing without the rest of the question to make it clearer :/
9. (Original post by Alexion)
Yeah it's real confusing without the rest of the question to make it clearer :/
Here is the question paper from what i can see:
Question 1:
Both of the responses here are correct, although i prefer the method (because it works all the time every time)
Attached Images
10. unit 5 physics oscillations questions.pdf (407.0 KB, 262 views)
11. (Original post by Zacken)
Huh? The axes should be swapped, no?
You don't seem to have done that, as far as I can tell from your numbers. It seems to work out fine if you swap the axes then read off the values. As it stands, the graph doesn't make much sense - time only seems to exist between -2 and +2.
12. (Original post by atsruser)
You don't seem to have done that, as far as I can tell from your numbers. It seems to work out fine if you swap the axes then read off the values. As it stands, the graph doesn't make much sense - time only seems to exist between -2 and +2.
I assumed it was a typo on the question setters part and mentally swapped the labels on the axes.
13. (Original post by Zacken)
I assumed it was a typo on the question setters part and mentally swapped the labels on the axes.
Err, yeah, but your numbers don't seem right though. T= 3 s, and A= 1.5 m, no?
14. (Original post by atsruser)
Err, yeah, but your numbers don't seem right though. T= 3 s, and A= 1.5 m, no?
Right... I'll need to get myself declared legally blind.
15. Thank you so much.

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