Teachers, to demonstrate to the elementary student that some gases are heavier than others, this experiment uses Winnie the Pooh and balloons to do just that.

The concept of air resistance is discussed in terms of why a heavier object falls faster than a lighter object when both dropped from the same height. In this discussion and animation, an elephant and feather are used as examples.

Students learn that it is incorrect to believe that heavier objects fall faster than lighter objects. By close observation of falling objects, they see that it is the amount of air resistance, not the weight of an object, which...

Do heavier and lighter objects fall at the same rate? Galileo hypothesized that objects fall at the same rate regardless of their mass. Complete this module to find out if Galileo was right by comparing position-time and velocity-time...