ABSTRACT
We live on the surface of a planet that exerts a gravitational pull on all objects, attracting them towards its centre. In order for us to move or to move objects, this attraction has to be overcome. This is what our muscles do, originating forces that are the cause of movement. If the body is still, a force applied to it makes it move. If the movement occurs horizontally, it is necessary to maintain the force applied to overcome friction, otherwise the body stops moving.
