Determine the moment about the Rod AB | Vector Mechanics Beer Johnston | Engineers Academy

Want to master finding the moment about a line in vector mechanics? In this detailed tutorial, we show you exactly how to use the scalar triple product method to solve engineering mechanics problems step-by-step.
What You’ll Learn in This Video:
The concept of moment about a line (axis) in mechanics
Why the scalar triple product is the fastest way to find it
How to write the correct vectors for position
How to determine the unit vector along the line


Full worked example with clear calculations
Common mistakes students make and how to avoid them
Formula Used:
M
line =u⋅(r×F)
​
=u⋅(r×F)
Where:
u
u = Unit vector along the line (axis)
r
r = Position vector from a point on the line to the force’s point of application
F
F = Force vector applied


Who This Video is For:
Mechanical engineering students
Civil engineering students
Anyone learning Engineering Mechanics or Vector Statics
📌 Pro Tip: Practice with different vector problems to fully understand how moments work in 3D space.
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