Science
Free-body diagrams.
Definition
A simplified drawing that shows all the forces acting on a single object as arrows. Each arrow represents a force, with its length indicating magnitude and its direction showing where the force acts. They are essential for solving problems using Newton's laws.
How it works · 6 phases
Step by step.
- Identify the object of interest and isolate it
- Draw the object as a simple shape (dot or box)
- Identify all forces acting ON the object (gravity, normal, friction, tension, applied)
- Draw each force as an arrow starting from the object, pointing in the correct direction
- Label each force with its name or symbol
- Use the diagram to set up Newton's second law equations (ΣF = ma)
Examples
Real-world.
- 1 A book on a table with gravity pulling down and the normal force pushing up
- 2 A box being pushed across a floor showing applied force, friction, gravity, and normal force
- 3 A hanging sign with tension forces in the cables and gravity pulling down
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