Fluid Mechanics

Question 1

Define drag force

Answer 1

A force that acts in opposition to motion

Question 2

What are the 2 types of drag

Answer 2

–Surface drag
–Form drag

Question 3

What is surface drag

Answer 3

Relates to friction between surface of object and fluid environment
E.g. swimmers wear smooth clothing to reduce this

Question 4

What is form drag

Answer 4

Relates to impact of fluid environment on object
E.g. cyclist using another’s slipstream

Question 5

Define streamlining

Answer 5

Involves shaping a body so it can move as effectively and quickly through a fluid as possible

Question 6

What are the factors that affect drag

Answer 6

–Velocity of the moving body
–The cross-sectional area of the moving body
–The shape and surface characteristics of a moving body

Question 7

How does velocity of the moving body affect drag

Answer 7

Greater the velocity of a body through a fluid, the ^ drag force

Question 8

Example of How velocity of the moving body affect drag

Answer 8

Cyclists will experience greater air resistance in their competition which increases drag. Therfore they streamline

Question 9

Define bernoullis principle

Answer 9

When air molecules extert less pressure the faster they travel and more pressure when they travel slower