Exam-style question
Try this first
Which of the following statements is true regarding the principle of moments?.
- A.It applies only to static objects.
- B.It can be applied to dynamic systems.
- C.It is only valid for horizontal forces.
- D.It requires a net force to be zero.
Model answer
What a good answer should say
- It requires a net force to be zero.
Explanation
Why this works
The principle of moments applies when the net force and net moment acting on an object are both zero, indicating that the object is in equilibrium.
Common mistake
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