What two aspects of a force do scientists measure?
a. position and size
b. size and stability
c. magnitude and direction
d. strength and magnitude

1.       The answer is C.
It is the magnitude and the direction that the scientist considered to measure the aspect of force.
=> Magnitude can be describe in 3 terms.
In mathematics it is considered as the relative size of an object.
IN Astronomy, it is considered as the measure of brightness and differences of brightness in astronomy study
And in earthquake, it is a measure of the energy of earthquake.
=> Direction is a course or  an explicit instruction where a certain object move.