Chapter 15 Biomechanics

Front 1

Buoyant force is directly related to what?

Back 1

volume

Front 2

Which of the following quantities are forces?

Back 2

all of the above

-friction
-buoyancy
-weight

Front 3

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

Back 3

laminar flow

Front 4

Which of the following is not true about drag?

Back 4

all of the above are true

-it is a force caused by the action of a fluid
-it is affected by surface area
-it is affected by the density of the fluid

Front 5

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

Back 5

drag

Front 6

Which of the following factors affects skin friction drag?

Back 6

all of the above

-increase in the relative velocity of fluid flow
-the surface area of the body over which the flow occurs
-the viscosity of the fluid

Front 7

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?

Back 7

-Surface drag
-profile drag

both A and B

Front 8

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

Back 8

-the roughness of the body's surface
-the body's velocity relative to flow

both A and B

Front 9

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

Back 9

lift

Front 10

Which of the following factors affects lift force?

Back 10

all of the above

Front 11

Lift force occurs in which direction?

Back 11

all of the above

Front 12

Which of the following quantities affects a discus as it travels through the air?

Back 12

-surface drag
-lift force

both A and B

Front 13

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

Back 13

wave drag

Front 14

Relative velocity of the fluid affects which of the following?

Back 14

all of the above

Front 15

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

Back 15

-It is created by spin on a ball.
-It is created by a pressure differential.

Both A and B are true

Front 16

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

Back 16

the propulsive drag theory

Front 17

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

Back 17

Bernoulli principle

Front 18

Which of the following explains buoyancy?

Back 18

Archimedes principle

Front 19

Fresh water is more dense than which of the following?

Back 19

air

Front 20

Which of the following is considered a fluid?

Back 20

-air
-water
-molasses

all of the above

Front 21

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

Back 21

density

Front 22

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

Back 22

relative velocity

Front 23

Which of the following statements is accurate?

Back 23

-As a fluid becomes denser, it exerts greater forces on moving body.
-As a fluid becomes denser, it becomes more viscous.

both A and B

Front 24

Which of the following are inversely related?

Back 24

density and specific weight

Front 25

Which of the following statements is always true?

Back 25

center of volume is in the same place as center of buoyancy

Front 26

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

Back 26

buoyant force must equal or exceed weight

Front 27

Which two forces are always opposite in direction?

Back 27

buoyancy and weight

Front 28

Why were so many world records set at the 1968 Olympic Games in Mexico City?

Back 28

higher altitude reduced drag force

Front 29

Total drag is greater for which athletes?

Back 29

swimmers

Front 30

Which of the following is true regarding passive drag?

Back 30

-generated by a swimmer's body size, shape, and position in the water
-inversely related to a swimmer's buoyancy

both A and B

Front 31

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

Back 31

-roughness of the body surface
-amount of surface area in contact with the fluid

Both A and B

Front 32

How do dimples on a golf ball reduce form drag?

Back 32

produce a turbulent boundary layer

Front 33

“Drafting” can reduce which kind of drag?

Back 33

form drag

Front 34

Which of the following is considered a foil shape?

Back 34

-human hand
-discus

Both A and B

Front 35

Ski jumpers attempt to do which of the following?

Back 35

increase lift and decrease drag

Front 36

Which of the following statements is/are true?

Back 36

-Angle of attack and release angle both affect horizontal range.
-Angle of attack and release angle are independent of each other.

Both A and B

Front 37

Topspin on a tennis ball will have what effect?

Back 37

-Ball will drop sooner.
-Ball will rebound lower.
-Ball will rebound faster.

All the above

Front 38

A curve ball pitch follows which path?

Back 38

smooth arc

Front 39

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

Back 39

-increase in flight time
-increase in range

both A and B

Front 40

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

Back 40

propulsive drag