Understanding the Phenomenon in the Attached Picture

[firavia]

please explain to me this phenomena (Details in the picture attached)

- after answering my 2 questions , I would like to make a modification in the picture , the modification is : shifting the force F 1 to the left for 0.5 m , after shifting it 0.5 m would we have a moment at "B" and at "A" , please explain why if yes and and if there was a moment on "A" and "B" in the first condition explain it why , though as I know , free end bodies cannot have moments explain , Am I CONFUSING BETWEEN STATICS AND DYNAMIC EXPLAIN THE DFFERENCE , thnx

 

[Doc Al]

If I understand your diagram, the object pictured is accelerating. Taking moments about some point is only useful if that point is the center of mass or is not accelerating. In this case, points A and B are neither.

 

[charng]

The phenomenon shown in the attached picture is a classic example of a lever system. A lever is a simple machine that consists of a rigid bar or beam that is able to rotate around a fixed point called the fulcrum. In this picture, the fulcrum is represented by the point where the two forces, F1 and F2, intersect. The lever system works by applying a force, F1, at a distance from the fulcrum, which creates a moment or torque that causes the beam to rotate around the fulcrum. This rotation can be used to lift or move objects, as shown in the picture.

Now, to address your questions and the proposed modification, let's first clarify the concept of moments. A moment is a measure of the tendency of a force to cause rotation around a point or axis. In the original picture, there is a moment at point "B" because the force, F2, is acting at a distance from the fulcrum, creating a clockwise rotation. However, at point "A", there is no moment because the force, F1, is acting directly at the fulcrum, causing no rotational effect. This is why you are correct in stating that free end bodies cannot have moments.

Now, if we were to shift the force, F1, to the left by 0.5 m, we would indeed create a moment at both points "A" and "B". This is because the force, F1, is now acting at a distance from the fulcrum, creating a counterclockwise rotation at point "A" and a clockwise rotation at point "B". This modification changes the equilibrium of the system and creates a state of dynamic equilibrium, where the system is still balanced but has the potential to move.

To further clarify, the difference between statics and dynamics is that statics deals with objects at rest or in a state of constant motion, while dynamics deals with the effects of forces on objects in motion. In this case, the original picture represents a static equilibrium, where the forces are balanced and the beam is at rest. With the proposed modification, the system is still in equilibrium, but it is now in a state of dynamic equilibrium, where the forces are balanced but the beam has the potential to move.

In conclusion, the phenomenon shown in the attached picture is a lever system, where the forces create moments that cause the beam to rotate around a fixed point. With the proposed modification