6. Deformation of solids

Question 1

how it deformation caused

Answer 1

deformation in one dimension is caused by tensile or compressive forces

Question 2

load, extension, compression and limit of proportionality

Answer 2

load-

extension-

compression-

limit of proportionality-

Question 3

Hooke’s law

Answer 3

extension is proportional to applied force

Question 4

spring constant

Answer 4

k = F/ x
spring constant= force/extension

N/m^2 = Nm^-2

Question 5

stress, strain and the Young modulus

Answer 5

stress- normal force per unit cross sectional area- force/cross sec area

strain- extension per unit unstretched length- extension/ original length

Young’s modulus = σ / ε
stress per unit strength

Question 6

describe an experiment to determine the Young modulus of a metal in the form of a wire

Question 7

elastic deformation, plastic deformation and elastic limit

Answer 7

elastic deformation-

plastic deformation-

elastic limit-

Question 8

area & gradient under the force–extension graph

Answer 8

area=work done to extend wire/spring
area= elastic potential energy stored in wired

gradient= spring constant if force on y-axis. if force on x-axis then gradient = 1/k.

Question 9

elastic potential energy- formula and graph

Answer 9

elastic potential energy of a material deformed within its limit of proportionality- area under the force–extension graph.

Ep=1/2 Fx
Ep=kx^2