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A Level Physics Solid Materials Force Extension and Stress Strain Graphs Objectives .

53 be able to use the Hooke s law equation F k x where k isthe stiffness of the object54 understand how to use the relationships tensile compressive stress force cross sectional area tensile compressive strain change in length original length.

Young modulus stress strainAdditional skills gained Calculating the gradient of a graphical representation Identifying the value of the stiffness constant k Starter Calculate stiffness.

A ductile wire obeys Hooke s law with the limit ofproportionality of 16N At this point the wire has extendedfrom 20 50cm to 22 49cm Sketch a Force extension graph for this wire and calculatethe value of the stiffness constant.

You have 10mins ONLYExtension Sketch another force extension graph for a wire thatis stronger but more brittle In physics when stress is applied to aStress material the material will be put.

under strain i e strain is the result ofThis is a little like force and extension except this time it takesinto account the area of the material so that it s specific to thetype of the material that is used and is not specific to a certain In physics when stress is applied to a.

Strain material the material will be putunder strain i e strain is the result ofStrain is simply the extension change in length over the originallength Note that it has no unit as it s a ratio of two lengths It susually given as a percentage so don t forget to convert that.

e g 2 0 02 NEATLY sketch this graph You ll beStress Strain Graphs annotating it so make it fit abouthalf a pageThese graphs are useful as they relate to the material itself rather than the sample .

This one shows a copper wire being stretched strained by ever increasing stressThe graph is proportional up topoint A This is the Hooke s law is obeyed only to.

this pointPoint B is the limit at which thewire will return to its originaldimensions this is known asthe .

NEATLY sketch this graph You ll beStress Strain Graphs annotating it so make it fit abouthalf a pageThese graphs are useful as they relate to the material itself rather than the sample This one shows a copper wire being stretched strained by ever increasing stress.

Point C is the yield point forstresses greater than this thewire will start to behave Point D is the maximum stress.

that the wire can endure it isknown as the ultimate tensileIf an object was described asstronger then this point wouldbe located .

Brittle Vs DuctileA brittle material can often bestrong high UTS but will breakwithout ever having a region ofplastic deformation.

A ductile material can bestretched into wires because itwill have a large plastic region After elastic limit Metal Graphs.

Annotate the graph in order to compare the strength ductility andbrittleness of high carbon steel and copper and suggest real life functions Young s ModulusNamed after Thomas Young Young smodulus is the measure of the stiffness of a.

material but taking into account thedimensions I e it s like the stiffness constant but for astress strain graph Young s Modulus .

Young modulus E Practice QuestionA copper wire of length 1 76m is stretched by a force toa length of 1 8m what is the tensile strain in the wire The same copper wire has a diameter of 0 22mm and is.

stretched using a force of 100N What is the Young smodulus of this material Question SheetComplete the solid material practice sheet questions Objectives .

53 be able to use the Hooke s law equation F k x where k isthe stiffness of the object54 understand how to use the relationships tensile compressive stress force cross sectional area tensile compressive strain change in length original length.

Young modulus stress strainAdditional skills gained Calculating the gradient of a graphical representation Identifying the value of the stiffness constant k .

A ductile wire obeys Hookeâ€™s law with the limit of proportionality of 16N. At this point, the wire has extended from 20.50cm to 22.49cm. Sketch a Force-extension graph for this wire and calculate the value of the . stiffness . constant. You have 10mins ONLY

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