Question

At a point on the beam where shear force changes signs, the bending moment at that point is

• A. zero
• B. decreasing
• C. maximum
• D. increasing

Hint:

When the shear force changes sign, the bending moment is zero because the slope of the bending moment curve becomes zero.

Answer 1

The Correct Option is A

Step 1: Understand the relationship between shear force and bending moment.
At any point on a beam, the shear force is the derivative of the bending moment. When the shear force changes signs, the slope of the bending moment curve is zero, indicating that the bending moment at that point is zero as well. Step 2: Conclusion.
At the point where the shear force changes signs, the bending moment reaches zero. Final Answer: \[ \boxed{0} \]