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Jun 17, 2008

Problem 5/155



I am having difficulty starting problem 5/155. What fixed point should be used to solve for omega? VB is only going to move in the positive j direction but I don't see how that helps you.
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CMK said...

My suggestion is to first work with the link formed by BC.
* Write down the rigid body velocity equation between points B and C.
* The velocity of C is known completely (both magnitude and direction). The direction of the velocity of B is known (vertical).
* From this vector equation you have two scalar equations (x- and y-components)and two unknowns: the speed of B and the angular velocity of BC. Solve these two equations.
* Write down the rigid body acceleration equation for BC. The acceleration of C is known (zero) as well as the direction of the acceleration of B (vertical).
* Solve for the acceleration of B and angular acceleration of BC from the two components of this acceleration equation.

Now that you know the angular velocity and angular acceleration of the bar, you can write the acceleration of A in terms of the acceleration of C. Here you will use the angular velocity and acceleration of the bar found above.

Let us know if this does not help.

June 17, 2008 at 6:59 PM

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