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This demonstration has been designed to show how a structure reacts to a certain input force. Here are some important points about the demo:


CONTROLS

• Click and drag the upper purple vector and observe the reaction force.
  
• Enter a force into the side window under beside the Input Force heading. Press enter.

DEMO DESCRIPTION

• Points A and B respresent are where the stucture is connected to ground. Connection A is a joint that does not allow any movement of the triangle. Connection B is an extension of the triangle that rests on the ground. Therefore connection B has no X direction reaction force or (-Y) direction reaction force. Connection A always has an X and Y reaction force when a force is applied to it.
• The purple vector that exits perpendicular to the triangle at joint A is the moment. The moment exists when the input force is negative since there is a twisting reaction created at point A since point B does not supply a reaction force.