drag

Question 1

drag

Answer 1

force created by the dynamic action of a fluid that acts in the direction of the force stream fluid flow
-resistance force as an object passes through it

Question 2

total drag

Answer 2

=skin drag + form dragm+ wave drag

Question 3

skin drag aka surface drag

Answer 3

1) velocity of fluid passing over object
2) velocity of object moving through fluid
3) smoothness of object

Question 4

skin drag

Answer 4

influences:
-smoothness/roughness (hair)
-velocity of object
-velocity of fluid

Question 5

form drag

Answer 5

influenced by:
-relative velocity
-size of surface area perpendicular of there fluid flow

Question 6

stream lining

Answer 6

-seen in cars
-taper front and back- improves pressure difference

Question 7

wave drag

Answer 7

-front edge meets water
influenced by:
-up and down motion
-relative velocity of fluid
-relative velocity of object
-surface area coming in contact

Question 8

lift force

Answer 8

Bernoulli’s principle
-downward and upward force
-perpendicular to fluid flow
influences:
-angle of attack (airplane speeds up, tilt)
-coefficient of lift
-velocity
-area
-fluid density
-lift/drag ratio

Question 9

Magnus effect

Answer 9

-spin
-top and back spin
-side spin
*backspin lift force due to spin