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MECH 234 & 235

MECH 234 & 235. Engineering Mechanics: STATICS. Prof. G. Milano, PE. 239-Colton Hall 973-596-5930 milano@njit.edu Office Hours 4:00 - 5:00 M,W. It’s on the web:. Course Outline General Information Examples Homework Solutions Tutoring Schedule. STATICS.

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MECH 234 & 235

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  1. MECH 234 & 235 Engineering Mechanics:STATICS

  2. Prof. G. Milano, PE • 239-Colton Hall • 973-596-5930 • milano@njit.edu • Office Hours 4:00 - 5:00 M,W

  3. It’s on the web: • Course Outline • General Information • Examples • Homework Solutions • Tutoring Schedule

  4. STATICS The study of force systems in equilibrium;i.e., balanced force systems.

  5. STATICS  F = 0 (forces) all forces add up to zero the system is balanced

  6. STATICS  M = 0 (moments)moments add up to zero the system is balanced

  7. DYNAMICS  F = maforces do not equal zero the system is unbalanced

  8. DYNAMICS  T = Jmoments do not equal zero the system is unbalanced

  9. Forces are Vectors • length = magnitude • angle = orientation • arrowhead = direction

  10. Forces are Vectors • rectangular coordinates • polar coordinates

  11. Rectangular CoordinatesF = 4i + 3j Length =Magnitude 3 units vertical 4 units horizontal

  12. Rectangular CoordinatesF = 4i + 3j Hypotenuse =4² + 3² = 5 3 units vertical 4 units horizontal

  13. Polar Coordinates F = 5  36° Length = 5 units Vertical axis  = 36° Horizontal axis

  14. Polar Coordinates F = 5  36° Length = 5 units Y comp. = 5 sin 36°  = 36° X component = 5 cos 36°

  15. Force Vector • F = 5  36° • F = 5 cos 36° i + 5 sin 36° j • F = 4i + 3j • 5 = length = magnitude • 36° = angle = orientation

  16. Force Vectors • graphical solutions • add vectors head to tail • analytical solutions • add like components

  17. Let’s get to work ... Let’s look at some examples from the book and on the web.

  18. Let’s go to the web... Some files are .pdf and you’ll needthe Adobe Acrobat Reader. Download it FREE.

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