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559821
Solids
Descripción
A Levels Physics Mapa Mental sobre Solids, creado por luisnorth el 18/02/2014.
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a levels
physics
physics
a levels
Mapa Mental por
luisnorth
, actualizado hace más de 1 año
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Creado por
luisnorth
hace alrededor de 10 años
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Resumen del Recurso
Solids
Density
Density= m/v
ρ
Mass per unit volume
Springs
Hooke's Law
Extension applied is directly proportional to the load applied
Providing the limit of proportionality is not exceeded!
ΔL ∝ F
F=KΔL
K= Spring constant in n/m
Some materials do not obey, eg. rubber
Young's Modulus
Tensile Stress
The perpendicular force applied per unit cross-sectional area
Tensile Stress = F/A
Pa or N/m^2
Tensile Strain
Extension produced per unit original length
No units
ΔL/L
Ratio of tensile stress applied to tensile strain produced
Pa or N/m^2
E or Y
Stress- Strain graph
Gradient = E
Area underneath = Strain energy per unit volume
Force-Extension Graphs
F= EA/L ΔL
EA/l = gradient
E = gradient * l / A
Energy Stored
Work Done = Force x Distance
FΔs = Area under graph
= 1/2 b x h
= 1/2 ΔL x F
= 1/2 F ΔL
Energy Stored = Work Done
1/2 F ΔL
Key Terms
Limit of proportionality- The point beyond which Hooke's law is no longer obeyed
Elastic behaviour- Original size & shape is regained after force is removed
Plastic Behaviour- Some permanent deformation when force is removed
Elastic Limit - The maximum amount of stretch whilst still regaining original size and shape when force removed
Yield Point- The point at which the material 'gives' a little. There is a marked increase in extension due to crystal planes sliding across eachother
Ultimate Tensile Strength - The maximum tensile stress that can be applied to a material without it breaking
Stiff - Very little deformation when a force is applied
Brittle - Very stiff and breaks with hardly any plastic deformation
Fracture - Cracks appear on the surface of the solid when a force is applied causing it to break
Ductile - Shows plastic deformation
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