Topic 11 0.0 / 5 ? PhysicsMaterialsASAQA Created by: Jemma1494Created on: 06-06-21 12:47 Hooke’s law F = K ΔL The force applied to a spring is proportional to the extension K = spring constant 1 of 18 Elastic limit The point at which the force on a spring has cause so much extension that it wont return to its original length 2 of 18 Cuboid volume V = h x l x w 3 of 18 Cylinder volume V = (πd^2)/4 x h 4 of 18 Sphere volume V = 4/3 πr^3 5 of 18 Springs in series Two spring attached on below the other Same tension ΔL = ΔLa + ΔLb 1/K = 1/Ka + 1/Kb 6 of 18 Springs in parallel Two springs attached at the same level next to each other Same extension F = Fa + Fb 7 of 18 Tensile stress The tension of a spring over its area σ = F/A 8 of 18 Tensile strain The extension of a spring over its initial length ε = ΔL/L 9 of 18 Youngs modulus A measure of stress over strain of a spring E = σ/ε E = TL/AΔL 10 of 18 Force extension graph Area is the elastic potential Ep = 1/2FΔL 11 of 18 Elastic potential Ep = 1/2FΔL = 1/2KΔL^2 12 of 18 Stress strain graph Linear graph = hookes law Linear -> curved = limit of proportionality/ elastic limit 13 of 18 Plastic deformation Occurs one the spring has exceeded the elastic limit 14 of 18 Elastic limit The largest extension possible before the spring can’t return to it’s original length 15 of 18 Strongest spring graph Steep gradient shows lower strain under stress 16 of 18 Plastic spring graph Curved line shows plastic deformation and high strain under stress 17 of 18 Weak / elastic spring graph Shallow gradient shows high strain under stress 18 of 18
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