In physics he was taught by Lorentz and de Sitter . Lorentz retired in 1912 when Ehrenfest was appointed to his chair. Struik was strongly influenced by Ehrenfest and attended the weekly seminar which he set up.
Sa physics siya ay tinuturuan sa pamamagitan ng Lorentz at de pasahero. Lorentz nagretiro sa 1912 kapag Ehrenfest ay hihirangin upang angkinin ang kanyang upuan. Matindi ang Struik ay naiimpluwensyahan ng Ehrenfest at nag-aral sa lingguhang pantas-aral na kung saan siya mag-set up.