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 Jan 3 awarded Popular Question Aug 1 awarded Popular Question Jul 27 awarded Popular Question May 5 awarded Popular Question Jan 17 revised How can we theoretically calculate the number of balloons needed to stop a bullet? edited title Jan 17 asked How can we theoretically calculate the number of balloons needed to stop a bullet? Jan 3 revised Is there any net external force acting on the universe? added 113 characters in body; edited title Jan 3 asked Is there any net external force acting on the universe? Nov 30 awarded Popular Question Nov 30 asked Can the relative position of two masses connected by a spring become negative? Nov 22 accepted Is there a normal force on an object submerged in water? Nov 22 comment Is there a normal force on an object submerged in water? @VladimirVargas: Why isn't there a normal force? Nov 22 comment Is there a normal force on an object submerged in water? @VladimirVargas: Without touching the bottom of the container for sure. Nov 22 asked Is there a normal force on an object submerged in water? Nov 2 accepted What is the net force acting on a climbing man by the rope? Nov 2 accepted When we are walking or running, which friction is exerted on our feet? Kinetic or static? Nov 2 comment When we are walking or running, which friction is exerted on our feet? Kinetic or static? Sorry, do you know the source of your theory? :-) Nov 2 asked When we are walking or running, which friction is exerted on our feet? Kinetic or static? Oct 20 comment Which inertial observer should I choose when using $\Delta U = -\Delta K$? The earth is rotating, why can we define $\Delta U$? Oct 20 accepted Which inertial observer should I choose when using $\Delta U = -\Delta K$?