Why doesn't energy rely on time, but only changes for an object in motion?
Say you are pushing an object as you walk, and your arm bone can exert 1,001 N (I made up this number) of force before breaking, using KE = 1/2mv^2 the energy exerted by and on it increases with speed if 1,000 N is constantly applied, but the force never changes. Does this mean that you can exert more energy on something without exerting more force on it, and having no change in stress levels? How or how not?
Also, similarly, since kinetic energy increases faster than force when pushing an object then what role does energy really play in it?