Radians, angular speed, and the centripetal force that keeps a coin on a turntable, a ball on a string and a planet in orbit. Play the simulations, then test yourself on original Paper 4 style questions.
Interactive · liveThe centripetal trackerAngular speed, linear speed, acceleration and the centre-pointing force.Loads only when you launch, so the page stays fast.
Interactive · liveTension around the loopWhy the string tension peaks at the bottom of a vertical circle.Loads only when you launch, so the page stays fast.
Interactive · liveThe conical pendulumSpin it faster and watch the cone open as the angle grows.Loads only when you launch, so the page stays fast.
Paper 4 practice · live
Structured questions · with worked solutionsTen original Paper 4 style questionsA full topic set covering angular quantities and centripetal force, each question linked to its lesson, with worked solutions.Open practice →