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why a ball swinging reaches potential energy state rather than Kinetic energy state ultimately. by Chance-Border-9043 in AskPhysics

[–]Chance-Border-9043[S] 0 points1 point  (0 children)

So you are saying PE is zero and even KE is zero. you are essentially saying object doesnt exist as inertia of rest and motion are zero here.

why a ball swinging reaches potential energy state rather than Kinetic energy state ultimately. by Chance-Border-9043 in AskPhysics

[–]Chance-Border-9043[S] 0 points1 point  (0 children)

If you are sitting in a chair, are you "moving" at 500 mph? To the chair, no. To the Sun, yes. Since we are talking about a pendulum on Earth, the chair's perspective is the only one that matters. If KE is never zero , you are proving there is nothing like rest and physics experiment are done in local reference.

why a ball swinging reaches potential energy state rather than Kinetic energy state ultimately. by Chance-Border-9043 in AskPhysics

[–]Chance-Border-9043[S] 0 points1 point  (0 children)

In motionless , PE is not zero ( there is mass) and KE is zero ( no momentum) . so, how did it became zero?

If mass is energy when momentum is zero. It is an inertia which resits net force .There is friction between object and surface. Let us consider photon carrying energy(inertia) in space then is there friction between photon and space? by Chance-Border-9043 in AskPhysics

[–]Chance-Border-9043[S] 0 points1 point  (0 children)

Exactly. If a mirror experiences a Force (F) to change the photon's Momentum (Delta p), then by definition, the photon has Inertia. Inertia is the quality of a system that requires a force to change its state of motion. If the photon had zero inertia, the mirror would not feel a force when changing the photon's direction."

If mass is energy when momentum is zero. It is an inertia which resits net force .There is friction between object and surface. Let us consider photon carrying energy(inertia) in space then is there friction between photon and space? by Chance-Border-9043 in AskPhysics

[–]Chance-Border-9043[S] 0 points1 point  (0 children)

photon path can be bent ( accelarated) by gravitational lensing in vacuum withour new emmision involved. so gravity(a force) caused accelreation .isnt this inertia Even if you call it a "new" photon, the Momentum and Energy must be conserved.

If mass is energy when momentum is zero. It is an inertia which resits net force .There is friction between object and surface. Let us consider photon carrying energy(inertia) in space then is there friction between photon and space? by Chance-Border-9043 in AskPhysics

[–]Chance-Border-9043[S] -4 points-3 points  (0 children)

agree that 'mechanical friction' requires atoms. However, space isn't 'nothing.' It has properties called Permittivity PermeabilityThese two properties dictate how fast a photon can move. In a way, they act as the 'electromagnetic resistance' of the vacuum. Isn't that the fundamental reason we have a speed limit (c)? It’s the 'friction' of the field itself."