There is no difference between "factor of safety" and "safety factor." They are two ways of saying the same thing.
A numeral factor is a coefficient.
coefficient of static friction is the value needed to get the object moving, while coefficient of kinetic friction is the value needed to keep the object moving
A coefficient is a number, a multiplier or a factor which measures a property.
By itself there is none. A coefficient is the multiplying factor in a polynomial equation.
A variable is a part of a term which can change. A coefficient is a numerical constant, associated with a variable. For example, in the term 3x^2 , 3 is the coefficient, while x is a variable.
The numerical factor of a term is called the "coefficient."
Positive temperature coefficient is if temperature increased then resistance also increased but in negative temperature coefficient if temperature increasing then resistance must decreased.
A constant is just a number, while a coefficient is associated by one or more variables, for example -2x, 5x2y, -zw, ect. We say that a coefficient is the numerical part of a term.