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Balancing Act

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PhET Interactive Simulations
University of Colorado Boulder


  • Balance
  • Proportional Reasoning
  • Torque
  • Lever Arm
  • Rotational Equilibrium


Play with objects on a teeter totter to learn about balance. Test what you've learned by trying the Balance Challenge game.

Sample Learning Goals

  • Predict how objects of various masses can be used to make a plank balance.
  • Predict how changing the positions of the masses on the plank will affect the motion of the plank.
  • Write rules to predict which way a plank will tilt when objects are placed on it.
  • Use your rules to solve puzzles about balancing.
Version 1.1.11