A force of 5N act at a point Y on a rod XYZ as shown in the diagram above, if XY is 2m. What is the moment of the force about point X?
A
0Nm
B
3Nm
C
7Nm
D
10Nm
E
reflection and diffraction
Verified Correct Answer: A.
Physical Principles & Numerical Solution
X is in the line of action of the force, Therefore moment is equal to zero.
Moment = force x perpendicular distance. ( x is horizontal distance, not perpendicular distance)
Source: Official Exam / Past Question Archive