Free Body Diagrams and Net Force
Free body diagrams are vector diagrams that show all forces acting on a single object. When creating these diagrams, you must properly label each force to track what's happening. This visual tool makes complex physics problems much easier to solve.
When analyzing forces, remember that equilibrium occurs when net force equals zero. This means the object is either motionless or moving at a constant velocity (no acceleration). When the net force isn't zero, the object must be accelerating—either speeding up or slowing down.
To determine net force in multiple dimensions, consider each dimension separately. For example, add all x-direction forces together, then all y-direction forces, and finally combine them using the Pythagorean theorem if needed. Remember the formula: net force = mass × acceleration.
Physics Tip: When solving problems, draw the free body diagram first! This visual representation helps you identify all forces and their directions before calculating anything.
