1.28 understand that the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam

1.28 understand that the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam

An object weighing 400 N is placed in the middle of the beam. The beam is not moving,so the upward and downward forces must be balanced. As the object is placed in the middle of the beam, the upward forces on the ends of the beam are same as each other. If it is moved right to one end of the beam, then the upward force will all be at that end of the beam. As it is moved along the beam, the upward forces at the ends of the beam change. In c) he is ¼ away from the plant. The upward force on the support nearest to him is ¾ of his weight and the upward force on the end of furthest beam is only ¼ of his weight.