The upper scale shows 5N Initially, and when 5N of force is exherted at the bottom, the upper scale shows a reading of 5N but the lower scale shows a reading of 10N. Why is it so?
For these type of problem,
1)Every force across one rolling wheel as an individual force.
2) Newton's Third Law when a string is pulling something
3) Seperate everything you can into free body diagrams.
Fundamentals of rolling wheels,
1) A 180degree pull with one rolling wheel ----> Force does not change, only changes direction
2) A 0degree straight pull with the string at the other end attach to something, draw out all the forces individually and consider the total force at each direction. (Dirty Trick : use logic to find out the factor of the length of the string to be pulled compared to a 180degree pull)
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