There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object.
Our reusable Quick-Crates have been certified by the US Army to transport 4,000 lbs of live ammunition per crate and stack 3 crates high when loaded. That translates to a stacking capacity of 12,000 lbs. Our crates have phenomenal strength despite the fact that they are made only with 3/4 plywood panels. Each specific crate's load capacity may differ based on the product you are shipping and weight distribution.
Then how do they haul those 260,000-450,000 lb excavators? A: According to our professional house lifter/mover, normal old houses weigh 60 to 80 tons. Since we still have the Time magazines from the Carter Administration and way too much furniture, he estimated that ours weighed in at about 85 tons.