Find the force (physics)

Question

1. Two humans are carrying a rod of lenght 2 m and mass of 50 kg. One human holds the rod on one end, the other on the another end.
2. Two humans are carrying a rod of lenght 2 m and mass of 50 kg. One human holds the rod on one end, the other human holds the rod with the distance of 1m from the another end.

Find the force that stresses on each human.

Answer 1

1 This is straight forward. The forces are balanced. Each human caries 1/2 of the load, so each human is bearing the weight of 1/2 * 50kg * 9.8 m/s^2 = 245J. Using the correct significant figures, the answer is 250J.

Problem 2 is similar, but the weight is not equal between the humans. Since the weight is balanced at the center, any force applied by the human at the end would cause the end of the rod to move up or down depending on the direction of the force. So the human in the middle of the rod (1 meter from the end of a 2 meter rod is in the middle) bears the entire force of 50kg * 9.8 m/s^2 = 490J.