Gravity

Doing Space - orbits and satellites yesterday - had some fun. Tied some rope (30 foot length) around the waist of a Y10 , I held the other end. I was the earth, he was the satellite/incoming meteor, the rope was the pull of gravity. He had to try and run in a straight line past me. He tried... and the rope pulled him in a neat circle around me - nicely reinfored some points about orbits after we'd already done the swinging bucket of water over the head demo.