____1. In three dimensions use the dot product to determine the moment, i.e., Mo
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Question
____1. In three dimensions use the dot product to determine the moment, i.e.,Mo= r x F. Remember that r is directed from point 0 to any point on the
line of action of F.
____2. The moment of a force indicates the tendency of a body to turn about an
axis passing through a specific point 0.
____3. A couple moment is produced by two collinear forces that are equal but
opposite. Its effect is to produce pure rotation, or tendency in a specified
direction.
____4. If a support prevents translation of a body in a specific direction, then the
support exerts a forces on the body in that direction.
____5. Never draw the free-body diagram first.
Explanation / Answer
1. False. We use cross product rather than dot product. 2. True. This is by definition of Moment. 3. True. This is by definition of Couple. 4. False. It exerts a force in the opposite direction. 5. False. Free Body diagram is the first thing to do while solving a statics problem.
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