Week 8 - Fluid properties & floatation

Question 1

What is a fluid?

Answer 1

any substance that tends to flow or continuously

deform when acted upon by a shear force

Question 2

Fluid properties

Answer 2

Atmospheric pressure and temperature influence:

Density, Viscosity and Specific Gravity

Question 3

Define density and its equation

Answer 3

How much matter is within a volume

p = mass/volume

p = density

Question 4

What happens to atmospheric density if air pressure increases

Answer 4

density increases because the mass of matter is high in high pressures

Question 5

Define viscosity

Answer 5

Resistance to fluid flow

Question 6

What happens to viscosity in gases when the temperature is increased

Answer 6

Viscosity increases

Question 7

What happens to viscosity in liquids when the temperature is increased

Answer 7

Viscosity decreases

Question 8

Define Specific Gravity

Answer 8

Ratio of the density of an object/substance to the density of a reference substance

Question 9

Example of Specific Gravity

Answer 9

You are more likely to sink in water if you are a lean muscly build as your body has a greater specific gravity to water

Question 10

Define floatation

Answer 10

Ability to float dependant upon your body density (and therefore specific gravity) and density of fluid

Question 11

Define buoyancy

Answer 11

Fluid force always acts vertically upwards

Question 12

Archimedes’ principle on buoyancy force

Answer 12

The magnitude of the buoyant force acting on a given body is equal to the weight of the fluid displaced by the body