Why is it easier to pick up a long pole at its center of gravity than to lift it horizontally from one end?

Question

Does it have anything to do with equilibrium at the centre of mass?

Answer 1

Hmmm. It has something to do with the torque you need to apply (to keep the long pole horizontal) if you pick it up at one end instead of at its center of gravity. However, you don't have to actually do any additional "work" if the pole remains horizontal. So, "easier" may not be relevant, depending on how heavy the pole is and how strong your wrists are.

If you just want to lift one end off the ground, it is actually easier to lift that end than to lift at the center of gravity because you have a 2:1 mechanical advantage, assuming the c.g. is in the middle.

When I am moving long poles, such as plumbing pipes or 2x4 lumber, I find it more practical to grip one end and let the other drag, if I can't find someone to help me by lifting the other end. Gripping a long, heavy, pipe in the middle makes it "easier" to lift but a bear to steer because it is difficult to apply sufficient torque to "aim" it where I want to go.

Answer 2

The centre of mass is where the weight can be considered to act. If the pole is held at the end, the weight generates a torque or turning effect which your hand has to oppose in addition to  lifting vertically.  Held at the centre of mass there is no turning effect as the line of action of the force (weight) passes through the fulcrum.

Answer 3

The even distribution of weight.