Discussion on: Problem 512 | Friction

Mohammed Ahmed's picture
Submitted by Mohammed Ahmed on May 27, 2015 - 11:52pm

Following is a discussion on the Reviewer item titled: Problem 512 | Friction.
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Mohammed Ahmed's picture

Submitted by Mohammed Ahmed on May 27, 2015 - 11:52pm.

please tell me ,how we got this ph=40(w sin x)+20(w cos x)

Jhun Vert's picture

Submitted by Jhun Vert on June 18, 2015 - 1:29pm.

The equation you mentioned is the moment about point A.
 

512-friction-c.gif

 

W sin (theta) = x-component of W or Wx and
W cos (theta) = y-component of W or Wy.

Monarch Chakri's picture

Submitted by Monarch Chakri on November 15, 2015 - 10:12pm.

IT'S VARIGNON'S THEOREM AS IT STATES MOMENT SUM ABOUT ANY PT. =SUM OF ALL MOMENTS DUE TO ALL FORCES =>FORCE*DIST = MOMENT

Sharvani Reddy's picture

Submitted by Sharvani Reddy on August 15, 2015 - 6:13pm.

then why dont u take w cos [theta] multiply with perpendicular distance to get moment about A
if y- component is wcos[thetA] then whAt About normAl reAction

Jhun Vert's picture

Submitted by Jhun Vert on September 10, 2015 - 4:54am.

whAt About normAl reAction

Analyze the forces involved when the block starts to tip over point A and you will find it why.