Making Inferences Why do you feel pain when you pull on
your hair or nails, but not when
you cut them?

So your hair and nails are made of Keratin and don’t have nerves In them but they do have nerves attached to them. So pulling your nail or hair triggers the nerves around them and send signals to your brain to trigger pain. This is kinda similar to a spider web. The spider isn’t connected to the fibers in her web but she does feel the vibrations around her from the web. If you damaged a part of the web she wouldn’t be injured herself but she will be disabled because she essentially is missing a part of the system which she uses to survive. ( fun fact spider vision is actually very poor so their webs act as their eyes)

When the ball is rising up, it gains kinetic energy. when the ball reaches the very top, it will have all potential energy, until it falls back down and gains it kinetic energy. finally when you catch the ball or it falls back down, it would have gained its potential energy back.