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# Adv. H Simple Harmonic Motion question watch

1. Any help on part a? Cheers
2. (Original post by Edgemaster)

Any help on part a? Cheers
Do you get given T=2π sqrt(m/k) in your formula sheet?
3. (Original post by Joinedup)
Do you get given T=2π sqrt(m/k) in your formula sheet?
Unfortunately no.

These are all the SHM/wave related equations we get. At least the ones we've used.
4. (Original post by Edgemaster)

Any help on part a? Cheers
Maybe work out spring constant using f=kx and f=mg.

Are u familiar with the formula joinedup used? Is it a formula u know but is not on formula sheet?
5. Also remember the restoring force is equal to kx.

So ma=-kx as the restoring force acts in opposite direction to displacement.

So a=-(kx)/m and a=-w^2x we can equate these to eliminate x and find expressions for the frequency and time period of an oscillating mass spring system.
6. (Original post by Shaanv)
Also remember the restoring force is equal to kx.

So ma=-kx as the restoring force acts in opposite direction to displacement.

So a=-(kx)/m and a=-w^2x we can equate these to eliminate x and find expressions for the frequency and time period of an oscillating mass spring system.
But where can I obtain k?
7. (Original post by Edgemaster)
But where can I obtain k?
When the spring is in equilibrium the force on the spring is equal and opposite to its weight so kx=mg when the mass spring system is in equilibrium.
8. (Original post by Shaanv)
When the spring is in equilibrium the force on the spring is equal and opposite to its weight so kx=mg when the mass spring system is in equilibrium.
I see. Makes total sense to me now. Thanks.

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Updated: November 6, 2017
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