Ok, I just don't understand fulcrum problems in physics...Myteacher gave us some practice tests for our upcoming exam and thesetwo are giving me trouble. Can anyone please explain thephysics behind these?
Socola is walking upa light-weight plank that is resting on a fulcrum as shown. Howfarup the plank (x) fromthe fulcrum can he walk, before the plank starts to tip? Assume theplank is uniform, weighs 100 N, and is 5 m long. Socola weighs 80N. (The answer is 1.0 m but how??)
The picture for thisproblem can be found here, #14