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What Is Normal Reaction ?How To Find It?
Normal reaction is the force acting among two contact surfaces. Like, if you push a wall, you will feel an opposite force acting on your hands. That's normal reaction.
You can search it by Newton third law, action and reaction are equal. For instance, if a block of 2 kg is lying on a table, it exerts a force of 20N (Mg) on the table, therefore the normal reaction is also 20N
solve
yes.fricton is working always opposite to the motion
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