Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 147
BCD, which its Ibr-wnrd path makes with DC, a perpendicular to the surface struck, iscalled the angle of incidence. The angle ECD, which its retreatingpath makes with the same perpendicular, is called the angle of reflection. It is found by measurement that these angles are equal whenthe two bodies… … WORK. 131 XV. WORK AND ENERGY. § 88. Work.— We have learned (§ 43) that a force may pro-duce either motion or pressure (or tension), or it may produceboth ellecLs ut the same time and in the same body. But a/ojre doeswork, in the seuse in vvliich this term is used in science, only when itproduces…
Physics
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