The bending moment can be positive or negative. Classify V for true statements and F for false statements regarding the bending moment: The bending...
The bending moment can be positive or negative. Classify V for true statements and F for false statements regarding the bending moment:
The bending moment is considered positive when the shear forces acting on the piece pull its lower fibers.
The bending moment is considered positive when the shear forces acting on the piece compress its lower fibers.
The bending moment is considered negative when the shear forces acting on the piece pull its lower fibers.
The bending moment is considered negative when the shear forces acting on the piece compress its lower fibers.
A V - F - V - F.
B V - F - F - V.
C F - V - V - F.
D F - V - F - V.
The bending moment is considered positive when the shear forces acting on the piece pull its lower fibers.
The bending moment is considered positive when the shear forces acting on the piece compress its lower fibers.
The bending moment is considered negative when the shear forces acting on the piece pull its lower fibers.
The bending moment is considered negative when the shear forces acting on the piece compress its lower fibers.
A V - F - V - F.
B V - F - F - V.
C F - V - V - F.
D F - V - F - V.
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Ed 
A resposta correta é a alternativa C: F - V - V - F. O momento fletor é considerado negativo quando as forças de cisalhamento atuantes na peça comprimem suas fibras inferiores.
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