# Forces in a Pulley System. First year statics homework

So basically I don't understand why my solutions to this problem are wrong and I don't know how to calculate the normal force. If someone could explain why my answers are wrong and explain the normal force part that would be great. The problem is given as follows:

"A man having a weight of 175 lb attempts to hold himself using one of the two methods shown. Determine the total force he must exert on bar AB in each case and the normal reaction he exerts on the platform at C. Neglect the weight of the platform." (The diagram has all the relevant info, it's not that complicated)

My solution: The answers in the text are a) F=175 lb, N =350 and b) F=87.5 lb, N=87.5 lb. I don't understand why my answers are basically reversed.

• When you push down or pull up on the bar it should effect the apparent weight of the person. Draw free body diagrams for the person, you should see what I mean.
– JMac
Apr 7, 2017 at 16:05
• You can not take down ward force as W in any case that is what you have to find, N ! Apr 7, 2017 at 16:21