• Sit on a swing and ask two of your friends to sit on the other two.
• Start swinging at the same time.
• Observe that the longer is the swing, the slower is its oscillation.
• You cannot swing faster sitting on a longer swing. If you like to swing faster, choose the shortest swing.
• A swing in the pendulum, the longer is the pendulum, the slower is its motion, and vice-versa.