Pumping Straw - a centrifugal pump (w/ video) -- "...When you spin the straw it forces the water inside to spin. If an object is spinning anything on that object appears to feel a force pushing it outward. This pseudo-force is called centrifugal force."
Pinterest pic - My review. "Worth doing for kids. They loved the sound of a hex-nut better". Spin a quarter in a balloon.....demonstrate centrifugal force. Spin a hex-nut in the ballon and it sounds like a bumble bee. Spin several nuts and it sounds like a swarm.
Centrifugal sprinkler ➪ Hands-on experiment for school (physics, mechanics, inertia, centrifugal force, pump -> A straw and a toothpick can turn into a pump with a twist of your fingers! Once you have secured anything you want to stay dry, this fun experiment is a good way to introduce centrifugal forces and the principle behind many pumps.