Biomechanics Quiz Question set 4.txt
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The "linear distance traveled divided by the time it takes to travel a specific linear distance" is the definition of which of the following concepts?
linear speed - rate of motion
Which of the following describe "a change in factor" that would decrease the time it takes to travel a specific linear distance?
an increase in the body's linear speed (s)
a decrease in the distance to be travelled (l)
Which of the following is/are examples of situations where the type of analysis used to study the activity is based on Newton's 1st law (i.e., no acceleration)?
movements that involve no change in motion
for example, ice skating
- -a body that is moving will continue to move in the same direction with the same speed
- -a body at rest will stay at rest
A skater gliding on ice will continue to move in the same direction, with the same speed and with no acceleration. This statement would be an example of Newton's _______ Law.
The product of a body's mass and its linear velocity defines...
linear conservation of momentum principle
If an athlete increases her velocity, what happens to her linear momentum?
linear momentum increase
Linear Conservation of Momentum "requires" which of the following conditions?
Changes in relative velocity cause changes in all of the following forces except?
everything except drag force and lift force
Dynamic fluid forces increase the most rapidly when which of the following factors increases.
The difference between an object's velocity and the fluid's velocity is the definition of...
The "dynamic fluid force that opposes motion of the body through a fluid" is the definition of which of the following concepts?
drag force principle
Which of the following factors affect the magnitude of the drag force?
"Drafting" (which reduces the relative velocity) can reduce which of type(s) of force?
"A flow characterized by smooth, parallel layers of fluid" is the definition of which of the following?
Which of the following is the name of the force that is created by a pressure differential between the front and back of a body moving through a fluid?
The two types of fluid motion that influence form drag are...
laminar flow (higher pressure)
turbulent flow (lower pressure)
The dimples on a golf ball travelling at greater than 20 mph influence drag force by...
-rougher surface will result in a smaller region of turbulent flow
In order to reduce "surface drag," you should...
wear skin tight clothes
remove body hair
Which of the following describe "a change in factor" that would decrease the magnitude of the drag force?
a decrease in:
The buoyant force acts in the ______ direction.
The buoyant force acting on your body when you are completely submerged under water is determined by knowing...
Whether or not a buoyant force exists depends on the density of the body
Which of the following forces always acts in a vertical direction (either positive or negative)?
Which of the following statement(s) is/are true regarding the density of fat and muscle tissue?
muscle and bone density is GREATER than 1000kg/m3 (will sink)
fat has a density LESS than 1000 kg/m3 (will float)
A submerged object will rise up to the surface if ______.
if the density is less than water
The inverse relationship between relative velocity and relative pressure (e.g., higher relative velocity results in lower pressure) in a fluid is called _______ principle.
The "dynamic fluid force that acts in a direction perpendicular to the motion of the body through a fluid" is the definition of which of the following concepts?
lift force principle
Lift can occur in which direction?
perpendicular (upward or downward lift)
Which of the following methods for creating Lift force would influence the time of flight and the horizontal distance travelled by a ski jumper?
changing the angle of attack
Which of the following statement(s) is/are true of the Magnus force?
when molecules strike the LOWER surface of the ball, they DON'T slow down as much
when molecules strike the TOP surface of the ball, they are slowed down MORE
"According to Bernoulli's Principle, then, less pressure will be exerted by the faster moving molecules on the bottom surface of the ball"
Which of the following forces would affect a spinning ball as it travels through the air?
Which of the following describe "a change in factor" that would increase the magnitude of the lift force?
AN INCREASE IN:
coefficient of lift
surface area for lift
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