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Physics vocabulary · Experiments and Problem Solving

Free-body diagram

Meaning in physics, with examples

nounCore term

In physics, free-body diagram means: A simple sketch of one object with labelled arrows for all the forces acting on it, each drawn in its own direction. It is the usual first step in solving a forces problem.

In Turkish: serbest cisim diyagramı, kuvvet diyagramı

How it is used

Teachers say 'start with a free-body diagram' or 'draw the FBD'. Only forces acting on the chosen object appear, never the forces it exerts on other things. Typical labels: W or mg (weight), N (normal force), T (tension), f (friction).

Example sentences

  1. Draw a free-body diagram for the box on the ramp before you write any equations.

  2. Your free-body diagram is missing the friction force acting up the slope.

Common collocations

  • draw a free-body diagram
  • label the forces
  • FBD
  • forceA push or a pull that can change how an object moves or change its shape. It has both size and direction and is measured in newtons (N).
  • net forceThe single force that has the same effect as all the forces acting on an object together. It is the vector sum of those forces and decides the object's acceleration.
  • normal forceThe push from a surface on an object that rests on it or presses against it. It always acts at right angles (normal) to the surface.
  • tensionThe pulling force in a stretched string, rope, cable or chain. It acts along the string and pulls on the objects attached at both ends.
  • weightThe force with which gravity pulls on an object. It equals mass times the gravitational field strength (W = mg), is measured in newtons and changes from planet to planet.

More terms: Experiments and Problem Solving

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