The educational resource shows a visual about the difference between mass and weight: mass is not the same as weight, although in ordinary life both words are used with the same meaning.

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.

Didactic unit about Rectilinear Movement for 4th year of compulsory secondary education. Uniform Movement (I). Uniform Movement (II). Uniformly Accelerated Motion (I). Uniformly Accelerated Motion (II).