Fluids

Question 1

Define Steady and Unsteady flows

Answer 1

Steady flow : the velocity of the fluid particles at any point remains the same at all times
Unsteady flow: the velocity of the fluid particles changes as time goes
Turbulent flow: the velocity of the fluid particles changes erratically both in magnitude and direction

Question 2

Differentiate between liquids and gases

Answer 2

Liquids : incompressible (ideal), higher density that isn’t dependant on change in temp/pressure , non viscous
Gas : compressible, lower density depending on change in pressure/temp , viscous

Question 3

State Pascal’s Principle

Answer 3

Any change in pressure applied to a completely enclosed fluid is transmitted undiminished to all the parts of the fluid and the enclosing walls

Question 4

State Archimedes’ Principle

Answer 4

Any fluid applies a buoyant force to an object that is partially or completely immersed in it, the magnitude of the buoyant force equals the weight of the fluid the object displaces

Question 5

What happens to an object that’s deeper in a fluid (mention FB, pressure)?

Answer 5

The deeper it is, the greater the pressure it experiences
The more fluid it displaces, therefore more FB