3A20.10 Mass on a Spring


Simple harmonic motion of mass-spring system


A mass hung from a spring undergoes simple harmonic motion when displaced from its equilibrium position. Changing the quantity of the mass affects the period of oscillation of the system.



  • [1] Spring
  • [2] Lab stand
  • [1] Metal rod
  • [2] 90-degree clamp
  • [1] Hook
  • [1] 50 g hooked mass
  • Various slotted masses

Classroom Assembly

  1. Place two lab stands on the table about 70 cm apart.
  2. Attach a metal rod to both stands using 90-degree clamps.
  3. Place a hook on the metal rod.
  4. Hang the spring from the hook.


  1. Hang the hooked mass from the lower end of the spring.
  2. Let the mass oscillate by displacing it from its equilibrium position.
  3. Add more mass and observe that there is a change in the period of oscillation.


Additional Resources


  • PIRA 3A20.10


  • Don't attempt this at home!

Last revised

  • 2018


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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.