The discussion revolves around calculating the moment arm and torque related to a force vector about a specific point. The subject area is torque in physics, focusing on the relationship between force, moment arm, and the resulting torque's magnitude and sign.
Participants are actively engaging in clarifying concepts related to torque and moment arms. Some guidance has been provided regarding the conventions for determining the sign of torque, and multiple interpretations of the moment arm are being explored.
There is an ongoing discussion about the conventions used for torque calculations, including the significance of clockwise versus counterclockwise directions. Some participants express uncertainty about the definitions and relationships involved, indicating a need for further clarification.
always use the magnitude ( positive number) of the force and position vectors and moment arm when calculating torques. The sign of the torque is then determined by clockwise or counterclockwise torque , ccw is plus in this example, cw is minus, simply by convention.negation said:
PhanthomJay said:
There are several ways to calculate torque about a point. One such way is to use torque = magnitude of force times the perpendicular distance from the line of action of the force to point, where the perpendicular distance is called the 'moment arm'. Another is to use the cross product rule. Sign of torque is plus if ccw, minus if cw, using the convention that ccw torques are positive.negation said:
PhanthomJay said:
No, the moment arm is the perpendicular distance from the line of action of the force vector to the point, which woukld be rm on your sketch.negation said: