Backpack Memes

Physics doesn't care about your feelings—or your backpack struggles. Carrying 12kg for 6km might feel like work, but without displacement in the direction of force, the physics equation gives you exactly zero joules. Your shoulders disagree, but the fundamental definition of work (W = F·d·cosθ) is ruthlessly precise. If you moved horizontally while the backpack force acts downward, that's a 90° angle and cos(90°) = 0. The laws of thermodynamics send their regards.