- #1
kirakun
- 25
- 2
Hi guys ^^ I am still at A level physics, so don't flame me for my lack of knowledge
Now i have been taught that for ex:
We have a block of wood named A at rest on a perfectly smooth surface.
If we analyse a free body diagram, we have a weight mg downwards acting on the block and a normal reaction force acting at the boundary of the block and surface. Also we have the same normal reaction, by the block on the ground at the boundary too.
So why do we have the misconception (maybe its me only XD) that the weight and the normal reaction cancel out.
Is'nt it really the weight and the force the block attracts the earth(laws of gravitation) which cancel each other.
I don't know if its "my" misconception, but I've seen many books very unclear about this.
Feel free to comment. Thank you :)
Edit: o.o if we assume what i said is true, then how do we assign a magnitude to normal reaction force? D: I am getting confused
Edit 2 : thanks a lot everyone, that cleared many doubts for me :)
Now i have been taught that for ex:
We have a block of wood named A at rest on a perfectly smooth surface.
If we analyse a free body diagram, we have a weight mg downwards acting on the block and a normal reaction force acting at the boundary of the block and surface. Also we have the same normal reaction, by the block on the ground at the boundary too.
So why do we have the misconception (maybe its me only XD) that the weight and the normal reaction cancel out.
Is'nt it really the weight and the force the block attracts the earth(laws of gravitation) which cancel each other.
I don't know if its "my" misconception, but I've seen many books very unclear about this.
Feel free to comment. Thank you :)
Edit: o.o if we assume what i said is true, then how do we assign a magnitude to normal reaction force? D: I am getting confused
Edit 2 : thanks a lot everyone, that cleared many doubts for me :)
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