| Subject | English | Spanish |
| mater.sc., mech.eng. | coefficient of friction | coeficiente de fricción |
| mater.sc., construct. | coefficient of longitudinal friction | coeficiente de fricción longitudinal |
| mater.sc., construct. | coefficient of longitudinal friction | coeficiente de resistencia al deslizamiento longitudinal |
| mater.sc., construct. | coefficient of longitudinal friction | coeficiente de rozamiento longitudinal |
| mater.sc., construct. | coefficient of transverse friction | coeficiente de resistencia al deslizamiento transversal |
| mater.sc., construct. | coefficient of transverse friction | coeficiente de rozamiento transversal |
| mater.sc., construct. | coefficient of transverse friction | coeficiente de fricción transversal |
| tech., industr., construct. | controlling appliance for coefficient of friction | aparejo de control de coeficiente de fricción |
| mater.sc., mech.eng. | friction coefficient | coeficiente de fricción |
| earth.sc., mech.eng. | skin-friction coefficient | coeficiente de rozamiento |
| earth.sc., mech.eng. | skin-friction coefficient | coeficiente de fricción superficial |