Deformation

Question 1

Deformation

Answer 1

Change in molecular separation

Question 2

Elastic potential energy/ Strain energy

Answer 2

Energy is stored in object due to deformation.
Ep=1/2Fx
=1/2kx^2

Question 3

Limit of proportionality

Answer 3

It is the limit up to which force is directly proportional to extension.
stress∝strain
Stress=E*Strain

Question 4

Hooke’s law

Answer 4

Within the limit of proportionality, force and extension are directly proportional to each other.
F∝x
F=kx

Question 5

Spring constant(k)

Answer 5

Force required to extend by unit length.
k=F/x

Question 6

Elasticity

Answer 6

The property of an object which regains its original shape after deformation when applied force is removed.

Question 7

Limit of elasticity

Answer 7

Limit up to which object can regain its original shape after deformation.

Question 8

Plastic deformation

Answer 8

When object is deformed beyond elastic limits, if applied force is removed and object doesn’t regain its original shape. The extension that remains is called plastic deformation.

Question 9

Series formula for k

Answer 9

K=F/2x
k/2

Question 10

Parallel formula for k

Answer 10

K=F/x/2
K=2f/x
2k

Question 11

Stress

Answer 11

Force exerted per unit cross-sectional area
=F/A

Question 12

Strain

Answer 12

Ratio of extension to original length.
=x/L

Question 13

Young modulus(E)

Answer 13

Ratio of stress to strain
E=stress/strain
E=FL/Ax

Question 14

Ultimate tensile stress

Answer 14

It is the maximum stress up to which a material can withstand without breaking.