In each of the scenarios below, a beam pivoted at its center (black dot) is acte

Question

In each of the scenarios below, a beam pivoted at its center (black dot) is acted upon by a single force. For each scenario, identify which lettered line (A C) correctly depicts the moment arm for this force. If the moment arm is zero, choose "None of the above." SCENARIO #1: Force Which line correctly shows the moment arm? O A O B O C O None of the above. The moment arm is zero. SCENARIO #2: Force Which line correctly shows the moment arm? O A O B o C O None of the above. The moment arm is zero. SCENARIO #3: Force Which line correctly shows the moment arm? O A O None of the above. The moment arm is zero. SCENARIO #4: Force

Explanation / Answer

Moment arm is the perpendicular distance of the force from the pivot point.

Thus we have the following:

1) B

2) None of the above. The moment arm is zero.

3) A

4) None of the above. The moment arm is zero.

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