SHM and why does the frequency not decrease?

[Dima Petrukhin]

Hello, I don't get it why does the frequency not decrease? As this i assume is damping and frequency must change.
And why do only positive peaks decrease?2 Not sure about equations needed.

3.I thought that as it is damped, Energy is lost as heat. Thus speed decreases, therefore, it takes a longer time to complete an oscillation.Thus, frequency decreases, however, the mark scheme says that it is constant
The part about decreasing peaks is due to damping(I assume) but I do not have a clue why only positive peaks decrease.

Please help, I am very confused. Thanks

 

[Orodruin]

Why would the frequency decrease? For a harmonic oscillator frequency is independent of amplitude.

 

[Dima Petrukhin]

Why would the frequency decrease? For a harmonic oscillator frequency is independent of amplitude.

thanks for your reply.
can you please help me with the 2 bit? why only +ve peaks decrease?

 

[phinds]

... only +ve peaks decrease?

Where are you getting this?

 

[Dima Petrukhin]

Where are you getting this?

http://pmt.physicsandmathstutor.com.../5.3-Oscillations/Set-M/Oscillations 1 MS.pdf
http://pmt.physicsandmathstutor.com.../5.3-Oscillations/Set-M/Oscillations 1 QP.pdf

Question 1C