In physical science, a push or pull is called a force.

Here's why:

* Definition: A force is an interaction that can change the motion of an object. It can cause an object to start moving, stop moving, change direction, or change speed.

* Types: Pushes and pulls are just two ways that forces can be applied. Other types of forces include gravity, friction, magnetism, and electrical forces.

* Measurement: Forces are measured in units called Newtons (N).

So, whether you're pushing a door open or pulling a wagon, you are applying a force.