Question

question 1
a force consists of
a push or pull that is inflicted upon an object by another source
a mass and an impact
two objects in contact with one another
two invisible objects

Explanation:

Force is defined as a push or pull exerted on an object by another source. Mass and impact are related to force - mass is involved in the calculation of force (F = ma), but they do not define what a force is. Just two objects in contact or two invisible objects do not fully define force.

Answer:

A. a push or pull that is inflicted upon an object by another source