<human>: I want to learn more about the physics of a slinky.
<bot>: Slinkies are fun! They're made up of two pieces of plastic connected by a spring. The springs have a natural frequency that is determined by their length and stiffness, which can be changed by stretching or bending them. When you move your hand up and down along the slinky, it moves back and forth at the same rate as your hand. This is because the slinky's mass is much less than the mass of your hand, so it doesn't affect the slinky's motion very much.