The educational resource shows information about the kinetic energy: the kinetic energy of an object is its capacity to change its environment, because it is moving. How far will two balls with different masses and velocities penetrate a block of snow?

The educational resource shows a visual about the free fall in vacuum: whatever their shape and mass, all bodies fall with the same speed in a vacuum.

The educational resource shows a visual about the free fall in air: when a body falls through a fluid such as air, its shape is important.

Concep of doppler effect.