Reaction force equals action force

Newton’s third law of motion states that for every action there is an equal and opposite reaction. Namely, if two bodies exert forces on each other, these forces have the same magnitude but opposite directions.

Links:

  1. Physics LibreTexts, green box.

action_force

The projection of the force that the first body exerts on the second body.

Symbol:

F_12

Latex:

\(F_{12}\)

Dimension:

force

reaction_force

The projection of the force that the second body exerts on the first body.

Symbol:

F_21

Latex:

\(F_{21}\)

Dimension:

force

law

F_12 = -1 * F_21

Latex:
\[F_{12} = - F_{21}\]