Bauer & Westfall

The task in this exercise is to draw all force vectors in the free-body digram for the seesaw beam. To do this, click on a forces on the lower left, which you believe to be present in this free-body diagram. Then you can draw a force vector by clicking on the point where the force acts and dragging the cursor. The cursor location determines the endpoint of the vector. Concentrate on the direction of the force vectors; the lengths of the vectors will be determined through calculations after the free-body diagram is constructed. Below the picture we display the angle of the vector drawn by you in degrees relative to the positive x-axis, followed by the (x,y) coordinate pair of the starting point of your vector in units of pixels relative to the center of the picture. A vector is counted as correct, if its angle is within ±5° of the exact answer, and if its starting point is no more than 15 pixels away from the exact solution. If you click once on the "Check My Work" button, we display your total score; if you click again, you also see which vectors have the correct angles and starting point; if you click a third time, we show you the full answer. "Reset" will allow you to erase everything and start over.