Solids and Fluids 2

Question 1

What is shear stress?

Answer 1

F tangent to the material surface/A

Question 2

Shear strain formula

Answer 2

∆x/L0

Question 3

Shear modulus?

Answer 3

stress/strain = (F/A)/(∆x/L0)

Question 4

Which forces act in 1D

Answer 4

Tensile, compressive and shear

Question 5

What is bulk stress?

Answer 5

Pressure from all sides acting perpendicular to material surface

Question 6

∆Pressure

Answer 6

results in volume change i.e volume strain

Question 7

Bulk modulus

Answer 7

Stress/strain = (-∆P)/(∆V/V0)

Sign is negative because object is getting smaller

Question 8

What is inelastic/plastic behaviour?

Answer 8

When an elastic object has been deformed past a certain point

Question 9

What is the elastic limit?

Answer 9

Stress beyond the certain point resulting in permanent deformation

Question 10

Why is it important for a bio molecule to not rupture?

Answer 10

Energy stored in the molecule is released + its bad for u don’t want leaky guts

Question 11

Stress curve of a bio molecule

Answer 11

J shaped

Question 12

What is density?

Answer 12

m/v

Question 13

Origin of pressure is cause by:

Answer 13

*Weight of particles above a given level
*Collision of particles w walls of container due to equal reaction with walls –> momentum –> force