11.4 fluid mechanics

Question 1

fluid mechanics

Answer 1

object traveling through any liquid or gas

Question 2

drag force

Answer 2

resistance force caused by the motion through a fluid
acts in opposite direction to motion
produced by air resistance and friction

Question 3

surface drag

Answer 3

friction between surface of an object and the fluid environment
- swimmers wear smooth clothing and shave in order to reduce this drag

Question 4

form drag

Answer 4

refers to the shape of the object in motion
-cyclists streamline and decrease their surface area in order to reduce this drag

Question 5

factors that +/- drag

Answer 5

velocity of moving body- faster = greater
surface area of body- larger=greater
shape of body- streamlines=less

Question 6

Bernoulli principle

Answer 6

the faster the air travels the less pressure created

Question 7

lift force

Answer 7

causes body to move perpendicular to direction of motion
keeps discus in the air

Question 8

angle of attack

Answer 8

tilt of projectile allowing it to travel further
discus- angle up so air above has to travel further so is at less pressure