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40 Cards in this Set
- Front
- Back
Buoyant force is directly related to what?
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volume
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Which of the following quantities are forces?
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all of the above
-friction -buoyancy -weight |
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"A flow characterized by smooth, parallel layers of fluid" is the definition of which of the following?
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laminar flow
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Which of the following is not true about drag?
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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 |
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The theoretical square law is related to which of the following?
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drag
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Which of the following factors affects skin friction drag?
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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 |
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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?
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-Surface drag
-profile drag both A and B |
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The nature of the boundary layer depends on which of the following?
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-the roughness of the body's surface
-the body's velocity relative to flow both A and B |
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Which of the following terms describes a force acting on a body in a fluid in a direction perpendicular to the fluid flow?
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lift
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Which of the following factors affects lift force?
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all of the above
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Lift force occurs in which direction?
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all of the above
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Which of the following quantities affects a discus as it travels through the air?
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-surface drag
-lift force both A and B |
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Which type of fluid resistance is likely to be greatest on a swimmer in the ocean at a fast speed?
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wave drag
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Relative velocity of the fluid affects which of the following?
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all of the above
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Which of the following statements is true of the Magnus force?
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-It is created by spin on a ball.
-It is created by a pressure differential. Both A and B are true |
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The theory attributing propulsion in swimming to Newton's third law is what?
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the propulsive drag theory
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The inverse relationship between relative velocity and relative pressure in a fluid is what?
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Bernoulli principle
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Which of the following explains buoyancy?
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Archimedes principle
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Fresh water is more dense than which of the following?
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air
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Which of the following is considered a fluid?
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-air
-water -molasses all of the above |
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A man's ability to float is most directly related to his what?
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density
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Which of the following is defined “velocity of a body with respect to the velocity of the wind (or other surrounding fluid)”?
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relative velocity
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Which of the following statements is accurate?
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-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 |
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Which of the following are inversely related?
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density and specific weight
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Which of the following statements is always true?
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center of volume is in the same place as center of buoyancy
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For flotation to occur, which of the following must exist?
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buoyant force must equal or exceed weight
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Which two forces are always opposite in direction?
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buoyancy and weight
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Why were so many world records set at the 1968 Olympic Games in Mexico City?
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higher altitude reduced drag force
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Total drag is greater for which athletes?
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swimmers
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Which of the following is true regarding passive drag?
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-generated by a swimmer's body size, shape, and position in the water
-inversely related to a swimmer's buoyancy both A and B |
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Which of the following factors that affect skin drag, can athletes usually alter?
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-roughness of the body surface
-amount of surface area in contact with the fluid Both A and B |
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How do dimples on a golf ball reduce form drag?
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produce a turbulent boundary layer
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“Drafting” can reduce which kind of drag?
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form drag
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Which of the following is considered a foil shape?
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-human hand
-discus Both A and B |
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Ski jumpers attempt to do which of the following?
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increase lift and decrease drag
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Which of the following statements is/are true?
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-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 |
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Topspin on a tennis ball will have what effect?
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-Ball will drop sooner.
-Ball will rebound lower. -Ball will rebound faster. All the above |
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A curve ball pitch follows which path?
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smooth arc
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Golf clubs are designed to impart backspin, which affects the ball in what way?
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-increase in flight time
-increase in range both A and B |
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Which of the following acts in the same direction as body motion?
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propulsive drag
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