PPT: Mechanical Properties of Solids | Physics Class 11 - NEET PDF Download

 Page 1


Mechanical 
Properties of 
Solids
Page 2


Mechanical 
Properties of 
Solids
I n t r o d u c t i o n
Solids have definite shape and size but can deform 
when force is applied
Elasticity: property of solids to return to original 
shape after force removal
Plastic deformation: when deformation becomes 
permanent
Understanding solid behavior under forces is 
crucial for engineering applications:
Applications include bridges, skyscrapers, 
machines, and prosthetic limbs
Page 3


Mechanical 
Properties of 
Solids
I n t r o d u c t i o n
Solids have definite shape and size but can deform 
when force is applied
Elasticity: property of solids to return to original 
shape after force removal
Plastic deformation: when deformation becomes 
permanent
Understanding solid behavior under forces is 
crucial for engineering applications:
Applications include bridges, skyscrapers, 
machines, and prosthetic limbs
Stress and Strain
When a solid is deformed, it develops an internal 
restoring force per unit area called stress.
Stress = Force / Area SI unit: Pascal (Pa)
There are different types of stress:
Page 4


Mechanical 
Properties of 
Solids
I n t r o d u c t i o n
Solids have definite shape and size but can deform 
when force is applied
Elasticity: property of solids to return to original 
shape after force removal
Plastic deformation: when deformation becomes 
permanent
Understanding solid behavior under forces is 
crucial for engineering applications:
Applications include bridges, skyscrapers, 
machines, and prosthetic limbs
Stress and Strain
When a solid is deformed, it develops an internal 
restoring force per unit area called stress.
Stress = Force / Area SI unit: Pascal (Pa)
There are different types of stress:
Types of Stress
Tensile/Compressive Stress: Causes a change in 
length.
Shearing Stress: Causes surfaces to slide relative 
to each other.
Hydraulic Stress: Acts equally in all directions (like 
in liquids).
Page 5


Mechanical 
Properties of 
Solids
I n t r o d u c t i o n
Solids have definite shape and size but can deform 
when force is applied
Elasticity: property of solids to return to original 
shape after force removal
Plastic deformation: when deformation becomes 
permanent
Understanding solid behavior under forces is 
crucial for engineering applications:
Applications include bridges, skyscrapers, 
machines, and prosthetic limbs
Stress and Strain
When a solid is deformed, it develops an internal 
restoring force per unit area called stress.
Stress = Force / Area SI unit: Pascal (Pa)
There are different types of stress:
Types of Stress
Tensile/Compressive Stress: Causes a change in 
length.
Shearing Stress: Causes surfaces to slide relative 
to each other.
Hydraulic Stress: Acts equally in all directions (like 
in liquids).
Types of Strain
Strain is the relative deformation produced in a body. It 
is a dimensionless quantity.
Longitudinal Strain: Change in length/original 
length.
· = ?L/L
Shearing Strain: Relative displacement/original 
length.
³ = ?x/y
Volumetric Strain: Change in volume/original 
volume.
» = ?V/V