What do we call a push or a pull upon an object which is caused by another object?

A physical processes vocabulary is one which includes words used when describing such processes. Isaac Newton was the English scientist who discovered some of the most basic laws about how things work in nature - the 'Three Laws of Motion'.  The first law says that an object at rest will stay at rest and a moving object will continue moving at the same speed and direction UNLESS another force acts on either object.