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Unformatted text preview: The sum of all the forces in z = 0 Equilibrium FBD F T W=mg F N 45 o 60 o F T W=mg F N 45 o 60 o F Nx F Ny ( ) ( ) ( ) ( ) cos 45 cos 60 sin 45 sin 60 x Nx Tx N T y Ny Ty N T F F F F F F F F mg F F mg = = + = + = = += + F Ty F Tx 3/1/2010 4 Moments Hinge: Is the moment axis (the door turns around this axis) Hand Force: The force required to push the door Engr Engr Engr 160 160 160 R has to turn CCW to line up with F This is the direction of the moment Top View of Door radius Force Moments They have magnitude Moment = r x F They have direction (CW or CCW) Right Hand rule: From the moment axis draw the length of the lever arm to the force Turn the lever arm into the force This is the direction of the moment Engr 160 CCW 3/1/2010 5 Sample Problem Engr 160 pin weight Sample Problem Engr 160 pin weight 3/1/2010 6 Sample Problem Engr 160...
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 Spring '07
 Sengupta
 Statics

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