# A Question about Hooke's Law...

• B
Okay...Hook's Law is stated as ''the force (F) needed to extend or compress a spring by some distance X is proportional to that distance. That is: F = kX (Wikipedia)'' And further on this topic there is a statement that
''Hooke's law for a spring is often stated under the convention that F is the restoring (reaction) force exerted by the spring on whatever is pulling its free end''...
My question is that, Is the force F the force which we apply continuosly for some time to extend the spring upto some distance X, or is it the force needed to ''hold'' the stretched spring at the distance X (the former force will obviously be greater than the second)??? If it is the first force than should'nt it be the second one???

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sophiecentaur
Gold Member
the former force will obviously be greater
hmmm. What is your argument to justify that statement? Do you just mean that it would be necessary to accelerate the mass of the spring by a finite amount`?

sophiecentaur
Gold Member
Is the force F the force which we apply continuosly for some time to extend the spring upto some distance X,
If you apply a constant force, starting from zero extension, you will end up with an oscillation around the equilibrium position. (If the spring has finite mass).

• Dale
Chandra Prayaga