In 2D, scalar math is fine. But once you hit , trying to use geometry alone will make your head spin. Unit Vectors: Master the
This involves Force, Mass, and Energy. When you see Vector Mechanics for Engineers
Remember that in this course, nothing bends. If it’s supposed to bend, you’re in the wrong class (that’s Strength of Materials!). In 2D, scalar math is fine
Remember that a pin support has two reaction forces ( ), while a roller only has one ( Nycap N sub y When you see Remember that in this course, nothing bends
), always remember the order matters. Use the determinant method to avoid simple sign errors. 3. Dynamics: Kinematics vs. Kinetics Students often confuse how things move with why they move.
or Work-Energy theorems, you are dealing with the causes of motion. 4. The "Work-Energy" Shortcut Before you dive into a massive calculation, ask yourself:
This is just geometry and time. Position ( ), velocity ( ), and acceleration (