Deck 15: Human Movement in a Fluid Medium

Question 1

Which of the following terms describes a force acting on a body in a fluid in a direction perpendicular to the fluid flow?

A)wave drag
B)surface drag
C)form drag
D)lift

Answer 1

lift

Question 2

The theoretical square law is related to which of the following?

A)friction
B)lift force
C)drag
D)none of these answers is correct

Answer 2

drag

Question 3

Which of the following factors affects lift force?

A)relative velocity of the fluid
B)fluid density
C)size,shape,and orientation of the body
D)all of these answers are correct

Answer 3

all of these answers are correct

Question 4

"A flow characterized by smooth,parallel layers of fluid" is the definition of which of the following?

A)relative velocity
B)turbulent flow
C)laminar flow
D)none of these answers is correct

Question 5

Buoyant force is directly related to what?

A)mass
B)weight
C)volume
D)density

Question 6

Which of the following factors affects skin friction drag?

A)increase in the relative velocity of fluid flow
B)the surface area of the body over which the flow occurs
C)the viscosity of the fluid
D)all of these answers are correct

Question 7

The nature of the boundary layer depends on which of the following?

A)the roughness of the body's surface
B)the body's velocity relative to flow
C)both the roughness of the body's surface and the body's velocity relative to flow
D)none of these answers is correct

Question 8

Which of the following explains buoyancy?

A)Archimedes' principle
B)Bernoulli principle
C)Magnus principle
D)None of these answers is correct

Question 9

The inverse relationship between relative velocity and relative pressure in a fluid is what?

A)Archimedes' principle
B)Bernoulli principle
C)Magnus principle
D)None of these answers is correct

Question 10

Which of the following statements is always true?

A)center of volume is in the same place as center of mass
B)center of volume is in the same place as center of buoyancy
C)center of mass is in the same place as center of buoyancy
D)all of these answers are correct

Question 11

Which of the following is not true about drag?

A)it is a force caused by the action of a fluid
B)it is affected by surface area
C)it is affected by the density of the fluid
D)all of these answers are correct

Question 12

Which of the following statements is true of the Magnus force?

A)It is created by spin on a ball.
B)It is created by a pressure differential.
C)Both it is created by spin on a ball and it is created by a pressure differential are true.
D)Neither it is created by spin on a ball nor it is created by a pressure differential is true.

Question 13

Which of the following is defined "velocity of a body with respect to the velocity of the wind (or other surrounding fluid)"?

A)resultant velocity
B)absolute velocity
C)relative velocity
D)all of these answers are correct

Question 14

Relative velocity of the fluid affects which of the following?

A)skin friction
B)wave drag
C)lift force
D)all of these answers are correct

Question 15

Which of the following statements is accurate?

A)As a fluid becomes denser,it exerts greater forces on moving body.
B)As a fluid becomes denser,it becomes more viscous.
C)Both as a fluid becomes denser,it exerts greater forces on moving body and as a fluid becomes denser,it becomes more viscous.
D)None of these answers is correct.

Question 16

The theory attributing propulsion in swimming to Newton's third law is what?

A)the propulsive drag theory
B)the propulsive lift theory
C)the vortex theory
D)none of these answers is correct

Question 17

For flotation to occur,which of the following must exist?

A)buoyant force must exceed weight
B)buoyant force must equal or exceed weight
C)weight must exceed buoyant force
D)weight must equal or exceed buoyant force

Question 18

Which of the following describes the drag created by a pressure differential between the lead and rear sides of a body moving through a fluid?

A)form drag
B)profile drag
C)surface drag
D)both form drag and profile drag

Question 19

A man's ability to float is most directly related to his what?

A)mass
B)weight
C)volume
D)density

Question 20

Which type of fluid resistance is likely to be greatest on a swimmer in the ocean at a fast speed?

A)skin friction
B)profile drag
C)wave drag
D)none of these answers is correct

Question 21

Choose the term that describes the velocity of a body with respect to the velocity of something else,such as water or air.

A)relative velocity
B)surface drag
C)theoretical square law
D)turbulent flow

Question 22

According to the theoretical square law,if a cyclist's velocity doubles,what will happen to the drag force opposing her?

A)drag force will decrease
B)drag force will remain the same
C)drag force will double
D)drag force will quadruple

Question 23

Topspin on a tennis ball will have what effect?

A)Ball will drop sooner.
B)Ball will rebound lower.
C)Ball will rebound faster.
D)Both ball will drop sooner and ball will rebound lower.
E)All of these answers are correct.

Question 24

Choose the term that describes the lift force created by spin.

A)Magnus force
B)propulsive drag
C)propulsive drag theory
D)propulsive lift theory

Question 25

Which of the following is true regarding passive drag?

A)generated by a swimmer's body size,shape,and position in the water
B)inversely related to a swimmer's buoyancy
C)associated with the swimmer in motion
D)both generated by a swimmer's body size,shape,and position in the water and inversely related to a swimmer's buoyancy
E)all of these answers are correct

Question 26

Choose the term that describes the substance that flows when subjected to shear stress.

A)coefficient of drag
B)coefficient of lift
C)fluid
D)foil

Question 27

Which of the following is considered a foil shape?

A)human hand
B)discus
C)shot put
D)both human hand and discus
E)all of these answers are correct

Question 28

Choose the term that describes a unitless number that is an index of a body's ability to generate fluid resistance.

A)pressure drag
B)coefficient of drag
C)form drag
D)wave drag

Question 29

Choose the term that describes the shape capable of generating lift in the presence of a fluid flow.

A)foil
B)form drag
C)pressure drag
D)profile drag

Question 30

Choose the term that describes the force acting on a body in a fluid in a direction perpendicular to fluid flow.

A)pressure drag
B)profile drag
C)laminar flow
D)lift

Question 31

How do dimples on a golf ball reduce form drag?

A)produce a turbulent boundary layer
B)produce a laminar boundary layer
C)both produce a turbulent boundary layer and produce a laminar boundary layer
D)dimples do not reduce form drag

Question 32

Golf clubs are designed to impart backspin,which affects the ball in what way?

A)increase in flight time
B)increase in range
C)both increase in flight time and increase in range
D)none of these answers is correct

Question 33

"Drafting" can reduce which kind of drag?

A)skin friction
B)form drag
C)wave drag
D)all of these answers are correct

Question 34

Choose the term that describes an expression of the inverse relationship between relative velocity and relative pressure in a fluid flow.

A)angle of attack
B)Archimedes' principle
C)Bernoulli principle
D)boundary layer

Question 35

A curve ball pitch follows which path?

A)straight line with sudden break at the end
B)smooth arc
C)can be either straight line with sudden break at the end or smooth arc
D)none of these answers is correct

Question 36

Choose the term that describes the flow characterized by mixing of adjacent fluid layers.

A)surface drag
B)theoretical square law
C)turbulent flow
D)laminar flow

Question 37

Choose the term that describes the resistance derived from friction between adjacent layers of fluid near a body moving through the fluid.

A)surface drag
B)pressure drag
C)form drag
D)wave drag

Question 38

Which of the following acts in the same direction as body motion?

A)wave drag
B)propulsive drag
C)skin friction
D)all of these answers are correct

Question 39

Which of the following factors that affect skin drag,can athletes usually alter?

A)roughness of the body surface
B)amount of surface area in contact with the fluid
C)viscosity of the fluid
D)both roughness of the body surface and amount of surface area in contact with the fluid
E)all of these answers are correct

Question 40

Choose the term that describes the following concept: the buoyant force acting on a body is equal to the weight of the fluid displaced by the body.

A)angle of attack
B)Archimedes' principle
C)Bernoulli principle
D)boundary layer

Question 41

Cyclists drafting will minimize form drag.

Question 42

A buoyant force is always directed vertically upward.

Question 43

A lift force created by spin is called ________ force.

Question 44

If weight is equal to buoyant force,a body will sink.

Question 45

Flow that is characterized by smooth,parallel layers of fluid is called ________ flow.

Question 46

The Bernoulli Principle explains the inverse relationship between velocity and pressure.