Hi eccentrically1,
Thank you for your reply.
Ok, there is an advance. You have accepted the validity of STEP 1. So let us then procede further to the next STEP 2.
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STEP 2.
1) Let us consider again the link
https://www.knowledgeuniverseonline.com ... -plane.php
as it is very illustrative.
2) Let us assume at first that (a) the body moves, (b) G = 1N and (c) the force of friction is 0.5 N for example. The 0.5 N force of friction does not influence the fact that the body exerts a vertical downward force G = 1N on the inclined plane and at the same time the inclined plane on its behalf exerts a vertical upward force -G = - 1N on the body. In other words G=-G, that is, the two forces G and -G are opposite in direction and equal in magnitude and this magnitude is equal to 1N.
3) Let us assume now that (a) the body moves, (b) G = 1N and (c) the force of friction is 0.1 N for example. The 0.1 N force of friction does not influence the fact that the body exerts a vertical downward force G = 1N on the inclined plane and at the same time the inclined plane on its behalf exerts a vertical upward force -G = - 1N on the body. In other words G=-G, that is, the two forces G and -G are opposite in direction and equal in magnitude and this magnitude is equal to 1N.
4) Let us assume now that (a) the body moves, (b) G = 1N and (c) the force of friction is 0.00001 N for example. The 0.00001 N force of friction does not influence the fact that the body exerts a vertical downward force G = 1N on the inclined plane and at the same time the inclined plane on its behalf exerts a vertical upward force -G = - 1N on the body. In other words G=-G, that is, the two forces G and -G are opposite in direction and equal in magnitude and this magnitude is equal to 1N.
5) In one word, the value of the force of friction (the latter being either substantial or negligible) does not influence the fact that the body exerts a vertical downward force G = 1N on the inclined plane and at the same time the inclined plane on its behalf exerts a vertical upward force -G = - 1N on the body. In other words G=-G, that is, the two forces G and -G are opposite in direction and equal in magnitude and this magnitude is equal to 1N.
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Do you accept the validity of this STEP 2?
Looking forward to your answer.
George
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P.S. In our last explanation approach there is not a direct logical path towards the zigzag conception. The logical path is indirect. So you have to follow our step-by-step explaining procedure, that is, STEP 1 is followed by STEP 2, and STEP 2 is followed by STEP 3, etc.