noun
counterforce; reaction force
Physics/engineering term for a force that opposes an applied force. Not used for emotional or chemical reactions.
壁が押し返す力は反力と呼ばれる。
The force with which the wall pushes back is called a reaction force.
構造計算では、支点に生じる反力を求める必要がある。
In structural analysis, it is necessary to determine the reaction forces at the supports.