PHYS 2A Chapter Notes - Chapter 11: Shear Stress, Stress (Mechanics), Elastic Modulus
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Center of gravity: the point at which the the entire force of gravity (weight) is concentrated. If g has the same value at all points on a body, its center of gravity is identical to its center of mass. Stress: characterizes the strength of the forces (cid:272)ausi(cid:374)g the defor(cid:373)atio(cid:374), o(cid:374) a (cid:862)for(cid:272)e per u(cid:374)it area(cid:863) (cid:271)asis. Elastic modulus: the harder you pull on something, the more it stretches. Tress / strai(cid:374) = elasti(cid:272) (cid:373)odulus (cid:894)hooke"s law(cid:895) Tensile stress: the cross section as the ratio of the force f to the cross-sectional area a. Compressive strain: of an object in compression is defined in the same way as the tensile strain, but delta(l) has the opposite direction. Bulk stress/bulk strain: a uniform pressure on all sides. Shear stress: one side is held down and the other side is pulled up, leads to deformation.
