In treatise “Knowledge” Bahmanyar discussing problems of logic and metaphysic considered the problems of physics which were observed by the Western scholars after centuries. He elucidated the elements of physics in the scientific way of that time. It is a substance structure; refutation of the fact that body consists of indivisible particles; motion and rest; kinds of motion in nature and trajectory; space and time; their pecularities. Bahmanyar investigated vacuum. There have been widely treated optical phenomena, reflection and refraction of light, focusing of light beams, mechanism of rainbow formation, character of solar beams and mechanism of contemplation. Bahmanyar revealed the essence of sound phenomena; process of origin, propagation and perception of sound and mechanism of echo origin. He considered a number of thermal phenomena, explained such processes as wind, earthquake and conception of subterranean spring water. He studied the process of solar and lunar eclipse as result of which it is also clear that the Moon is not a star, it reflects the light from the Sun. As a result of his investigation Bahmanyar concludes that in the Universe the only motion is the rotary one and thereby he makes a new suggestion of space and time properties “motion being rectilinear and going into the infinity does not exist”. Having a logic sensation of non-Euclidean space regularities in XI century Bahmanyar spoke about space distortion which was spoken about in general relativity theory created by Einstein only at the beginning of XX century.