Mechanical Properties of SolidS

Question 1

Elasticity

Answer 1

the property of a body by its vitue of which itt tends to regain iys original size and shape when the applied force is removed is elasticity

Question 2

which has more elasticity steel or rubber?

Answer 2

Steel has more elsaticity as the tendency to regain the original form is more of steel than rubber but up to a certain limit. This limit is called elastic limit. If we apply force more than the elastic limit, the body loses its property to come back to its orginial form.

Question 3

deforming force

Answer 3

force which changes the form of the object

Question 4

what are plastics?

Answer 4

if we apply force to a lump of putty or mud, they have no gross tendency to regain their previous shape and they get permanently deformed. such substances are called plastics. This property is called plasticity

Question 5

which substances are close to ideal plastics?

Answer 5

Putty and mud

Question 6

1 pasacl = ? N/m^2

Answer 6

1 pascal= 1N/m^2

Question 7

when a body is under stress? can it be in equilibrium

Answer 7

yes it can be euilibrium as whenforces are aplied on a body in such a way that the body is still in static equilibrium, it is deformed to a small or large extent depending upon the nature of the material and the magnitude of the deforming force

Question 8

when forces are applied on a body in such a way that the body is still under static equillibrium, deformation of body depends upon?

Answer 8

when forces are applied on a body in such a way that they body is still in static equilibrium, the deformation of body can be small or big depending upon the nature of the material and the magnitude of the deforming force.

Question 9

stress

Answer 9

restoring force per unit area 
F/A where F is force applied and A is area of cross section
scalar quantity
[M L^-1 T^-2]
Nm^-2 or Pa or pascal

Question 10

why is strain dimensionless ?

Answer 10

it is the ratio of change in dimension to original dimension, it has no units and hence no dimensional formula.

Question 11

Hooke’s Law

Answer 11

for small deformations, the stress and strain are proportional to each other. This is known as Hooke’s law