Materials

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Last updated: February 12, 2025

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Hint	Answer
How can density be calculated	mass/volume
what are the units for density	kgm-3
what is the definition of upthrust	an upward force that exerts pressure on a submerged object
what does stokes law apply to	the motion of falling objects through fluids
what is the definition of viscosity	a measure o f how resistant a fluid is to deformation
what does viscosity depend on	temperature
what does hookes law state	that extension is directly proportional to the force applied
what does k and x stand for in hookes law	stiffness of the object and extension
what is meant by stiffness	the extent to which an object resists deformation in response to an applied force
what is tensile stress	increase in length of an object
what is compressive stress	decrease in length of an object

Hint	Answer
what is strain	the deformation of a material from stress
what does Youngs modulus describe	the stiffness of a material
what is the point after hookes law is no longer obeyed	the limit of proportionality
what is it when you increase the force applied and the object deforms plastically	the elastic limit
what is meant by the yield point	the point at which the material begins to stretch without an increase in load
what is it when a shape returns to its original shape once the force applied is removed	elastic deformation
what is plastic deformation	where a materials shape is changed permanently
what is the breaking stress of a material	the value at which the material will break apart
what is elastic strain energy	when work is done on a material to stretch to compress it
what is the area under a force extension graph	work done

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