Conservation of energy in a pendulum
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A small pendulum swings. Students can measure the height of the pendulum above the equilibrium position, and the speed of the pendulum as it passes the equilibrium point. They can use these measurements to compare the mechanical energy at various times during the motion.
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Download (Quicktime Video 6.3MB Jun27 14)
Note that the mass of the pendulum bob is 450 grams.
- What is the kinetic energy during the first pass?
- What is the maximum gravitational potential energy of the bob (-earth system) when the bob is at the high point.
- What percent loss of mechanical energy during each swing?
- What is the increase in thermal energy of the system?