“Diffuse” refers to “diffuse reflection lights” in the light source calculation. The surface of an object is regarded as uniform, displaying reflected light. * See the item of “Specular”.
“Dynamic Friction” refers to “dynamic friction coefficient” of an object. Set the value of friction of a moving object between 0 and 1. The higher the value, the higher the coefficient of friction so that the greater force will be required to move the object.