Orbit Simulator
Fast enough, and it never comes down. Choose a speed and an angle, fire Newton’s cannon, and watch gravity bring the shot down, carry it round in orbit or let it go for good, then find it on the chart beside the escape line.
Put it in orbit with your class
Put it on a slide and your audience joins from their phones — no app and no accounts for them. Free to start.
Put it in orbit with your class — free