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Hi, I thought I had some sort of an understanding in physics until I came across these two websites. On the first page the person in the air exerts a force on the rope but for the rope and person to stay still another force must be exerted by person number two hence the doubling of the force on the pulley and the rope compared to the person's weight hanging in the air, correct? If so, then why does the same not apply to "group number 4" ont he second page? And futhermore, if this is true, then stepping on a force meter(an arrangement that measures normal force) should give me a reading that is double my weight, right? This is because while I press down on the meter, also the Earth presses against it. And as a result of this "bathroom" weighing scales must have been set to half the mass of the equivalent force applied to them. But obviously I've got something wrong here. So I would really appreciate guidance here!
https://www.physicsforums.com/newthread.php?do=newthread&f=61
http://dev.physicslab.org/Document.aspx?doctype=5&filename=Dynamics_StaticEquilibrium.xml
Thanks
br
Mark
https://www.physicsforums.com/newthread.php?do=newthread&f=61
http://dev.physicslab.org/Document.aspx?doctype=5&filename=Dynamics_StaticEquilibrium.xml
Thanks
br
Mark
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