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MECH 234 & 235 Engineering Mechanics: STATICS Prof. G. Milano, PE 239-Colton Hall 973-596-5930 [email protected] Office Hours 4:00 - 5:00 M,W It’s on the web: Course Outline General Information Examples Homework Solutions Tutoring Schedule STATICS The study of force systems in equilibrium; i.e., balanced force systems. STATICS F = 0 (forces) all forces add up to zero the system is balanced STATICS M = 0 (moments) moments add up to zero the system is balanced DYNAMICS F = ma forces do not equal zero the system is unbalanced DYNAMICS T = J moments do not equal zero the system is unbalanced Forces are Vectors length = magnitude angle = orientation arrowhead = direction Forces are Vectors rectangular coordinates polar coordinates 3 units vertical Rectangular Coordinates F = 4i + 3j 4 units horizontal 3 units vertical Rectangular Coordinates F = 4i + 3j 4 units horizontal Vertical axis Polar Coordinates F = 5 36° = 36° Horizontal axis Y comp. = 5 sin 36° Polar Coordinates F = 5 36° = 36° X component = 5 cos 36° Force Vector F = 5 36° F = 5 cos 36° i + 5 sin 36° j F = 4i + 3j 5 = length = magnitude 36° = angle = orientation Force Vectors graphical solutions add vectors head to tail analytical solutions add like components Let’s get to work ... Let’s look at some examples from the book and on the web. Let’s go to the web... Some files are the Adobe .pdf and you’ll need Acrobat Reader. Download it FREE.