Choose all that apply. According to the theory of matter proposed by John Dalton: all atoms of the same element have the same mass
combinations of atoms create chemical change
all matter is made up of atoms
all atoms of the same element have the same size

The casefor proofs

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on