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Apr 12, 2020 at 9:30 comment added wavion Yes, the reaction force from the wall becomes zero
Apr 12, 2020 at 8:28 comment added Lit_try Oh, I got it. When F becomes 0, static friction f also disappears, right?
Apr 12, 2020 at 8:20 comment added Lit_try Thanks for the comment. Then, what if F suddenly disappears here? For example, a person stops pushing the box (F = 0). Then it's: f = -R. Physically what does it mean? When two objects are in touch and at rest (when there are no "visible" pushing actions), they still are exerting on each other equal forces?
Apr 10, 2020 at 9:47 history answered wavion CC BY-SA 4.0