Anything that has push or pull creates a force. For anything to be undergoing motion a push or a pull force had to move it along. Forces can be created by many of different ways. Isaac Newton was fascinated with the concept of forces. He was especially keen to the concept of gravity. Gravity is a force that pulls things down to earth. Gravity is invisible and yet it is hugely influential on how anything travels on Earth and other planets.
The sheets in this series have a wide range of applications from basic push/pull forces to advanced applications of calculating speed and forces associated with it.