2nd codition of equilibrium

ROTATIONAL EQUILIBRIUM THE SECOND CONDITION OF EQUILIBRIUM

DIAGRAM OF CROSS WRENCH F F AXIS OF ROTATION

Definition of Terms ,[object Object],[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

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]

2nd codition of equilibrium

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2nd codition of equilibrium