強つよい相そう互ご作さ用よう

Meanings

strong interaction

In particle physics, the fundamental force that binds quarks together inside protons and neutrons, and holds the atomic nucleus together.

弱よわい相そう互ご作さ用よう
The weak interaction is another fundamental force, responsible for certain types of radioactive decay; it is much weaker than the strong interaction and acts over a shorter range.
電でん磁じ相そう互ご作さ用よう
Electromagnetic interaction governs electric and magnetic forces; unlike the strong interaction, it acts on charged particles and has an infinite range.
重じゅう力りょく相そう互ご作さ用よう
Gravitational interaction is the weakest fundamental force, acting between masses; it is negligible at the subatomic scale compared to the strong interaction.

Compound of 強い (strong) + 相互作用 (interaction), a calque of the English physics term 'strong interaction'.