Te Reo Physics Resources

Multimedia Physics and Science Teaching Resources


Faith in Physics


A heavy pendulum released from near a student’s nose will return to the same height and not quite touch her/him.

Principles Illustrated
Conservation of Energy. Pendulum motion.



English version


Mount the ball securely and let swing. See safety notes below.

Conserved Energy
Do you have faith in physics?
Safety Notice
Safety notice.

Other Information


It is very easy for a student to accidentally move forward during the demonstration and get a nasty bang. Be sure the pendulum is not angled upward as this will give it extra energy, and be sure the mount is secure and cannot slip. See illustration below. In general, it is probably best to use the video or substitute a glass or egg for the students if you do not have time to test the apparatus carefully.
Individual teachers are responsible for safety in their own classes. Even familiar demonstrations should be practised and safety-checked by individual teachers before they are used in a classroom.


This teaching resource was developed by the Te Reo Māori Physics Project with support from