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ROTATIONAL EQUILIBRIUM THE SECOND CONDITION OF EQUILIBRIUM
Introduction ,[object Object]
Introduction ,[object Object]
DIAGRAM OF CROSS WRENCH F F AXIS OF ROTATION
Definition of Terms ,[object Object],[object Object]
MOMENT ARM ,[object Object]
The  moment arm  of a force is the perpendicular distance from the line of action of the force to the axis of rotation.
THE MOMENT ARM A  B  C F  F  F
EXAMPLES OF MOMENT ARMS and Sign Convention NEGATIVE TORQUE F r
EXAMPLES OF MOMENT ARMS  and Sign Convention POSITIVE TORQUE F r
EXAMPLES OF MOMENT ARMS and Sign Convention POSITIVE TORQUE F r
EXAMPLES OF MOMENT ARMS  and Sign Convention POSITIVE TORQUE F r
TORQUE ,[object Object],[object Object]
TORQUE ,[object Object],Torque = force  x  moment arm τ   = Fr
Remember: ,[object Object],[object Object],[object Object]
ILLUSTRATIVE EXAMPLE 1 ,[object Object]
PLAN: ,[object Object],250 N 0.12m
SOLUTION: ,[object Object],[object Object],[object Object],[object Object]
SOLUTION: ,[object Object],[object Object],[object Object],[object Object],[object Object]
ILLUSTRATIVE EXAMPLE 2 ,[object Object],[object Object],[object Object]
SOLUTION: ,[object Object],60 º 20 lb r
From the figure, we obtain: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
THE SECOND CONDITION OF EQUILIBRIUM ,[object Object],[object Object],[object Object],[object Object]
Second Condition of Equilibrium ,[object Object]
Illustrative Example 3 ,[object Object]
Sketch of problem 300 N  200 N  400 N 6.00 m  4.00 m  4.00 m  12 m A  B
Plan ,[object Object],2m  6m  4m  4m 300 N  200 N  400 N A  B
Solution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
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2nd codition of equilibrium