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In the Graphics window, click on keypoint 1;
This will draw a small square around keypoint 1 to indicate that it's been picked.

In the pick menu, click Apply. The following menu shows up.

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Since we want to constrain UX as well as UY to zero at keypoint 1, select both UX and UY from items in DOFs to be constrained list. Since the Displacement value is zero by default, leave that field empty. Click on Apply.

You will see triangle symbols appear in the Graphics window indicating that both UX and UY DOFs are constrained at keypoint 1.

Next we apply the displacement constraint at keypoint 3. In the Graphics window, click on keypoint 3. In the pick menu, click Apply. Select only UX from items in DOFs to be constrained list. Click OK.

You will see a triangle symbol appear indicating that only the UX DOF is constrained at keypoint 3.

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In the Graphics window, click on keypoint 2; then in the pick menu, click OK.

In the menu that appears, select FY for Direction of force/mom.

Enter -2800 for Force/ moment value. Click OK.

The negative sign for the force indicates that it is in the negative y-direction. You'll see a vector indicating the applied force in the Graphics window.

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