what does reaction force mean?

Answer 1

a reaction force is a force that acts against the original force. for example: if you push down on a desk, the desk is actually pushing back at you which is the reaction force. just think: if it was NOT pushing back at you, your arms would just keep pushing untill your hands hit the ground.

Answer 2

Reaction Force Definition

Answer 3

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the statement punch a wall with 10 N is slightly incorrect when you are punching a wall, the moment your hand touches the wall, its almost instantly stopped the force that your hand experiences is plainly Mass times acceleration however here the acceleration is a big quantity, since your hand was stopped almost instantly, and you experience a much larger force, much more than the 10 N ... a mattress on the other hand doesnt stop your hand that fast, it does it slowly by absorbing energy into its springs and hence you dont feel that much pain!!! however if you press on a wall with 10N and if you press on a mattress with 10N(while its comressed) you will feel almost the same amount of force pushing back at you, and almost the same pain.

Answer 4

It means the force that is equal in magnitude (strength) but in opposition to the acting force. It comes from Newton's Third Law of motion explaining conservation of momentum. For example: You hit the table just as hard as the table hits you back, but the table hits up as you hit down, therefore the table hitting you hand is the reaction force.