>>12549374>>12549506They're imparting kinetic energy to the air around them which will have a net downward velocity vector. This air will apply some amount of force on the bottom of the jar when it collides. Afterwards the air will slow down as it travels axially due to friction and thus have far less upward friction forces against the walls of the jar that could counteract gravity.
However , the Van Der Waals forces between the air atoms would disrupt and slow down the flow of this air before it reaches the bottom of the jar, a very very tiny amount. This is encapsulated in the fluid mechanics property known as kinematic viscosity, or a fluid's own resistance to its own movement due to shear stresses of the moving fluid.
However still, if the .5 kg of flies are closely packed together and all just 1 body length away from the bottom of the jar then the scale will not read an exact 1kg mass. It will be between 1 and 1.5 because that air they're pushing down will not have enough space to slow down before it hits the bottom.
Conservative Trump supporter, the fraud was real, Qanon doesn't exist, and the earth is 6k years old.
