this example was used in many video not sure who is original. the most common roof in US is 4:12, and the assumption of three force seems just an assumption. I expect a wise person can use real example say 22' span normal load (30 pound) as a realistic example/
explained very well, i been confusing about positive and negative signs. now its clear. thank you.
this example was used in many video not sure who is original. the most common roof in US is 4:12, and the assumption of three force seems just an assumption. I expect a wise person can use real example say 22' span normal load (30 pound) as a realistic example/