Question

say what a moment is and how something will balance if the moments are equal and opposite

Answer 1

Answer:

In physics, a moment is an expression involving the product of a distance and another physical quantity, and in this way it accounts for how the physical quantity is located or arranged.

Moments are usually defined with respect to a fixed reference point; they deal with physical quantities as measured at some distance from that reference point. For example, the moment of force acting on an object, often called torque, is the product of the force and the distance to the object from the reference point. In principle, any physical quantity can be multiplied by a distance to produce a moment; commonly used quantities include forces, masses, areas, and electric charge distributions.