# Stretching of string (and tearing of string)

#### DesertFox

Also, it is mentioned this:

d2l/dt2 = (F/2) / (ρdl) = F/(2m)

m - mass

If that can actually help for better explanation of the context...

#### studiot

Looks like average force to me as I said.

Or if you prefer average acceleration since the acceleration varies from zero to max in a vibrating string.

#### DesertFox

Looks like average force to me as I said.

Or if you prefer average acceleration since the acceleration varies from zero to max in a vibrating string.
So:
1) the equation is form of F=ma;
2) "2" stays for the fact that the maximum stress is twice the average stress.

Right?

#### studiot

Works for me.

For your information the (strain) energy involved in stretching a string

E = 1/2 Max stress x strain = work done in raising the stress from zero to max. This is also = 1/2 Load x extension

I also think that the connection to waves is that your article must be about vibrating strings.
It would not involve Newton's Second Law for static stretching.

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#### DesertFox

Works for me.

For your information the (strain) energy involved in stretching a string

E = 1/2 Max stress x strain = work done in raising the stress from zero to max. This is also = 1/2 Load x extension

I also think that the connection to waves is that your article must be about vibrating strings.
It would not involve Newton's Second Law for static stretching.
That's right!

I am re-examining the text now- it's all about vibrating string, not about static straining.