Fluid Mechanics

Question 1

what are the 2 types of flow of projectiles moving through a fluid?

Answer 1

turbulent and laminar

Question 2

what is laminar flow?

Answer 2

this is when fluid layers move parallel to each other, ‘streamlined flow’

Question 3

what is turbulent flow ?

Answer 3

this is irregular and rough, it has small ‘whirlpool’ regions.

Question 4

what is a fluid ?

Answer 4

liquid or air

Question 5

whats fluid friction ?

Answer 5

as a fluid moves around an object, the fluid nearest the object slows down and moves around the object. The layer of fluid nearest the object is called the BOUNDARY layer

Question 6

what is the behaviour of the fluid around the object dependant on?

Answer 6

the shape of the object
speed of the object
viscosity of fluid, or stickyness of fluid

Question 7

what is drag?

Answer 7

drag force is an increase in fluid resistance, it resists motion. Performerss often need to overvome drag forces by using technical positions or through the use of technology.

Question 8

Examples of ways to reduce drag

Answer 8

• reduce cross sectional area e.g. tucked position when skiing or cycling
• manipulating surface properties using swimming caps or compression clothing
  -streamlining in swimming
• reduce surface area
• compression clothing in cycling
• Cricketers create more boundry layers on the ball to increase turbulant flow, this is known as swing