fluid mechanisms

Question 1

fluid mechanisms

Answer 1

concerned with movement of liquids and gases

Question 2

drag force

Answer 2

slows something down

Question 3

what are the two types of drag

Answer 3

surface drag-relates to friction between surface of an obejct and fluid environment
swimmers wear specialsied clothing and shave off body hair from arms to reduce surface drag

form drag-e.g swimmer has to create the slimmest and straigthest form when move through water to reduce form srag

Question 4

factors that reeduce and increase drag

Answer 4

velosity of moving bdy-greater the velocity of the body, the greater the drg force
try to reddcue by stremalining

cross sectional area of body-large cross sectional area of body, increases drag
reduce cross secitonal area by crouching low over handlebars rather then sitting up straight

shape and surfe more stremalined aaerodynmaic shape, reduces drag

Question 5

bernouli principle

Answer 5

when discus thrown, experinces an upward lift force
lift force enables discus to stay in air for longer, therefore, increaseing horizontal distance it travels
more lift projectile has, the longer it will stay in air for and further the horizontal distance travelled

higher pressure below discus creates an upward lift force, allowing disucs to stay in aur for longer, greater horzitntal distance travelled

down ward lift force
such as skiers, cylist and racing cars
happens because air that travels over op of car travles u8u8j8uj

Question 6

upward lift force

Answer 6

air that travles over top has to travl longer distance
faster veloicty and therefore lower pressure
below-has less distance to cover so travels at slow velocity and high pressure

Question 7

downward lift forec

Answer 7

air that ravels above has to trvale shorter diatnce so will trvale at sloweer velocity but high pressure

air that travles