What is the convention for the sign of the moment of a force? a) The moment is always positive. b) The moment is always negative. c) The moment i...
What is the convention for the sign of the moment of a force?
a) The moment is always positive.
b) The moment is always negative.
c) The moment is positive if the force tends to rotate the body counterclockwise and negative if it tends to rotate the body clockwise.
d) The moment is negative if the force tends to rotate the body counterclockwise and positive if it tends to rotate the body clockwise.
a) The moment is always positive.
b) The moment is always negative.
c) The moment is positive if the force tends to rotate the body counterclockwise and negative if it tends to rotate the body clockwise.
d) The moment is negative if the force tends to rotate the body counterclockwise and positive if it tends to rotate the body clockwise.
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Ed 
A convenção para o sinal do momento de uma força é que o momento é negativo se a força tende a girar o corpo no sentido horário e positivo se tende a girar o corpo no sentido anti-horário. Portanto, a alternativa correta é a letra d).
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