Students will test two variables, to determine their effect on the pendulum's period. Just as objects with different masses accelerate in free-fall at the same rate, changing the mass of a simple pendulum will not change its period. Changing the length of the pendulum does effect the period, with shorter pendulums having shorter periods.
![Simple Pendulum](http://www.arborsci.com/cdn/shop/articles/unnamed_85d54149-8c04-4eea-b07c-67856b1821cb_1100x.jpg?v=1663101994)