NDA 2024 · PYQ · Vectors / Moment of Force · medium
Consider the following in respect of moment of a force: 1. The moment of force about a point is independent of point of application of force. 2. The moment of a force about a line is a vector quantity. Which of the statements given above is/are correct?
A.1 only
B.2 only
C.Both 1 and 2
D.Neither 1 nor 2✓ Correct
Explanation
Statement 1 is incorrect: the moment of a force about a point depends on the position vector from the point to the line of action of the force, so it does depend on the point of application (specifically, on the perpendicular distance from the reference point to the line of action). Statement 2 is incorrect: the moment of a force about a line is the component of the moment vector along that line, which is a scalar quantity, not a vector. Hence neither statement is correct.
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