Big Ideas Of Science
The lab has a beam resting on two triangular supports. There is a second copy below that, showing the free-body diagram of the beam. The beam in the free-body diagram will turn red if the situation is unstable, indicating that the beam is in danger of tipping over. (That can only happen when the 20-newton box is added and positioned in a particular range of positions.)
One checkbox turns on the center of mass, so a purple dot is shown at the location of the center of mass. The other checkbox places a 20-newton box on the beam, at a location determined by one of the sliders.
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