fluid mechanics

Question 1

fluid mechanics

Answer 1

study of any object that travles through any liquid or gas

Question 2

examples of dynamic fluid forces

Answer 2

drag and lift

any projectile will experince a drag and lift force

Question 3

drag force

Answer 3

slows something down
resictnace force caused by motion od body travelling through liquid
has negeaitve ffect on velocity

produced from air restcnae and friction
cyclist will try to minimse drag to increase velocity

Question 4

what are the two types of drag force

Answer 4

surface drag-friction between surface of an object and the enviroment

form drag-

Question 5

factros that reduce drag

Answer 5

cross sectional area of the moving body
-largeer secitional area increases drag
cyclist may try to reduce there cross sectional area/make it smaller by crouching low over the handlebars ratherr then sitting upstraight

shape and surface
more streamlined aerodynamic shape reduces drag
wear streamlined clothing e.g helmet
aerodynamic helmet with air ducts designed to reduce drag even more

swimmers shave all body hair and wear
wear swimming cap or sahve hair off

Question 6

bernoulli principles for lift force and downward llift force

Question 7

lift force

Answer 7

body moves perpendicualr to the dircetion of the travel

air above is travleing longer diance then air below
fater velocity
creates lower pressure

air that travles below discus has less ditance to cover so travles at slower velocity, creates higher pressure

e.g discus throw

Question 8

downward lift force

Answer 8

creates friction e.g cycling down a slope

air travelling above traveles at a shorter distance then below
slower veloity
high pressure

air travlling below is travlling longer distance
faster velocity
low pressure