Main Question or Discussion Point
Hookes law says that f = kx where f = force, k = spring constant, and x = change in length. This doesn't make sense to me. Don't objects become harder to compress or stretch as they are compressed or stretched. For example, it is easier to stretch a rubber band when you first start stretching it. In other words, I don't understand why k is constant and doesn't change as the objects compresses or is stretched.