In this lesson, we will discuss pendulums and resonance in physics. A pendulum swings with a natural frequency that depends on the length of the pendulum and the mass at the end of the pendulum. Resonance occurs when a system is excited at the same frequency as the natural frequency of the device. At the resonant frequency, energy is efficiently coupled into the system. More Lessons: http://www.MathAndScience.com Twitter: https://twitter.com/JasonGibsonMath