00:01
Here are a short review on hook's law.
00:03
So it's really not a law.
00:07
It's more of a phenomenological observation that many materials, when you displace them from equilibrium, have a restoring force that tends to bring them back into equilibrium.
00:24
And that force gets stronger, the more you remove them off of equilibrium.
00:30
So it's a phenomenological relationship that applies to many different materials over a wide range of displacements.
00:43
So x in this case is displacement from equilibrium, and that's important is that you have a stable equilibrium, and then the force is going to try to restore to equilibrium.
01:06
And that's the significance of the negative sign is that the force is tending to pull the object back to its resting position.
01:19
And k is sometimes called the stiffness constant, sometimes called the spring constant, but it is usually a measure of how rapidly the object tries to get back to the equilibrium position.
01:36
So the place you would tend to see this is with a mass on a spring...