Question

If any force is applied in the direction of the positive x-axis, and there are three different point on which the moment of this force is to be calculated. Then if these three points are on the positive side of the y-axis with varying distance, then what will be the direction of the moment caused by the force to the individual point?

(a) Towards positive z-axis

(b) Towards positive y-axis

(c) Towards positive x-axis

(d) Towards negative z-axis

The question was posed to me by my college professor while I was bunking the class.

My question is based upon Moment of a Force topic in division Force System Resultants of Engineering Mechanics

Answer 1

Right choice is (a) Towards positive z-axis

To elaborate: If you will apply he right hand rule on the system given then the right answer is the positive z-axis. Which is because the force is lying on the x-axis and is heading towards the positive infinity of the x-axis. And the points are in the positive y-axis. Apply the rule, and get the direction.