What is a Gyroscope?

What is a gyroscope and how does it work? Watch this excellent physics video and find out. See how a simple gyroscope begins to behave differently when the inner wheel is spun. The video shows the unique consequences of angular momentum, something that allows the gyroscope to resist force when you try to tilt it and also enables it to stand on its end without falling over while the inner wheel remains spinning. Gyroscopes play important roles in aircrafts, ships, spacecraft and robots as well as other machines and devices.