When humanity first started studying motion, circles posed a peculiar puzzle. Why do planets sweep endlessly around the Sun without flying off into the void of space? Why does a stone swung on a ...

Learn the key differences between centripetal and centrifugal force in this clear and engaging physics tutorial! Understand how centripetal force keeps objects moving in a circular path, while ...

Chief meteorologist Mark Dixon checks out the science behind using a fire extinguisher to fire a pencil into a piece of plywood. Here's Jan. 4's Science Sunday.