Free body diagrams

• How to Draw a Free-Body Diagram for Circular Motion
  For circular motion, draw only real forces; their inward radial components must add to mv²/r. See worked diagrams for turns and strings.
• How to Calculate Net Force from a Free-Body Diagram
  Resolve every force on the free-body diagram into components, add signed components, then combine them to find the net force's magnitude and direction.