Biomech Exam 3 ACTUAL QUESTIONS
AND CORRECT ANSWERS
theta - CORRECT ANSWERS angular displacement
phi - CORRECT ANSWERS linear displacement
omega - CORRECT ANSWERS linear distance
sigma - CORRECT ANSWERS linear velocity
alpha - CORRECT ANSWERS angular acceleration
If an athlete was trying the maximize the distance of a long jump, which of the
angles listed below is the optimal projection angle in order to maximize long
jump distance? - CORRECT ANSWERS 45 degrees
If an athlete was trying to maximize the height of a vertical jump, which of the
angles listed below is the optimal projection angle in order to maximize vertical
jump height? - CORRECT ANSWERS 90 degrees
Which of the items listed below is an example of Newton's 3rd Law? -
CORRECT ANSWERS The barbell doesn't fall through the floor due to
the reaction force
Which of the items listed below is an example of Newton's 2nd Law? -
CORRECT ANSWERS The acceleration for a 50kg barbell acted upon
by a force, is less than 10kg barbell acted upon with the same force magnitude
,Which of the items listed below is an example of Newton's 1st Law? -
CORRECT ANSWERS A barbell doesn't move from the floor until it is
acted on by an outside force
The principle of conservation of momentum is most accurately described by
which of the statements below? - CORRECT ANSWERS Momentum of
an object is neither gained nor lost unless it is acted on by a force
Energy by virtue of a body's position - CORRECT ANSWERS
Mechanical energy
Index of elasticity for colliding bodies - CORRECT ANSWERS
Coefficient of restitution
Resistance of a body to change from a state of rest - CORRECT ANSWERS
Inertia
Rate of work production - CORRECT ANSWERS Mechanical power
Energy of motion - CORRECT ANSWERS Mechanical energy
Resistance force acting opposite the direction of intended motion - CORRECT
ANSWERS Friction
Total magnitude of force applied to an object over a period of time - CORRECT
ANSWERS Impulse
The energy transferred to or from an object by a force acting over a distance -
CORRECT ANSWERS Mechanical work
,Quantity of motion possessed by a body - CORRECT ANSWERS
Momentum
The capacity to do work - CORRECT ANSWERS Mechanical energy
We know that most joints in the human body rotate in some fashion, but unless
we use an x-ray we can't really see the ends of the bones where this rotation
occurs. Which of the statements below BEST identifies where the center of
rotation can be found in a particular joint as it moves through its range of
motion? - CORRECT ANSWERS The center of rotation of the joint
changes due to the ellipsoid shape of the end of the bone
What type of motion is the predominant form of motion that occurs at human
joints during activities of daily living? - CORRECT ANSWERS Angular
motion
A rehabilitation patient is attempting to lift a carton off the floor as part of a
functional assessment for return to work. The Physical Therapist you are
working with wants to measure the angle of the thigh with respect to the
calf/shank (the knee) of the patient. Therefore the PT is interested in which of
the variables below? - CORRECT ANSWERS Angle of flexion of the
knee
As a projectile is thrown into the air, it is common to examine the overall
velocity of the object as well as the vertical and horizontal components of the
object's velocity.
1. This component of the projection velocity remains unchanged for the entire
time frame that the object is in the air?
2. This component of the projection velocity for the object constantly changes
due to gravity (and the air resistance that we are ignoring)? - CORRECT
ANSWERS Horizontal velocity; Vertical velocity
, Which of the statements below is accurate concerning a projectile? - CORRECT
ANSWERS The horizontal velocity of a projectile is constant
In order to help calculate and determine the initial linear velocity of a golf club
head at the moment it strikes the golf ball, you MUST convert the known
angular velocity of the golf swing (375 deg/s) into radians. What is the angular
velocity of the golf swing with the units in radians? - CORRECT ANSWERS
6.54 radians/s
My daughter decided to use some of her excess energy and climb a rock
climbing wall. Upon reaching to top (25 meters) she lets go of the wall in order
to fall straight back down. Fortunately for her, she is connected to a belay
(safety rope) that slowly lowers her back down. If she had not been connected
to a belay, using your knowledge about projectiles, calculate how long would it
have taken for her to free fall from the top of the wall to the floor below? -
CORRECT ANSWERS 2.26s
In the previous question, my daughter who is 30kg decided to climb a rock
climbing wall. Upon reaching to top (25 meters) she lets go of the wall in order
to fall straight back down. Fortunately for her, she is connected to a belay
(safety rope) that slowly lowers her back down. What was her Potential Energy
at the top of the rock climbing wall? - CORRECT ANSWERS 7,357.5J
In a Kinesiology softball game, Joe is playing Right Field and attempts to throw
out a runner, Jack, running to 2nd base. Joe throws the ball from Right Field and
it is caught at 2nd base by the shortstop. Joe releases the ball at a 36° angle at a
height of 2.18m with an initial velocity of 25.5 m/s. The shortstop catches the
ball at a height of 0.25m. Ignore air resistance.
What is the magnitude of the HORIZONTAL velocity of the ball at the moment
of release? - CORRECT ANSWERS 20.63 m/s
AND CORRECT ANSWERS
theta - CORRECT ANSWERS angular displacement
phi - CORRECT ANSWERS linear displacement
omega - CORRECT ANSWERS linear distance
sigma - CORRECT ANSWERS linear velocity
alpha - CORRECT ANSWERS angular acceleration
If an athlete was trying the maximize the distance of a long jump, which of the
angles listed below is the optimal projection angle in order to maximize long
jump distance? - CORRECT ANSWERS 45 degrees
If an athlete was trying to maximize the height of a vertical jump, which of the
angles listed below is the optimal projection angle in order to maximize vertical
jump height? - CORRECT ANSWERS 90 degrees
Which of the items listed below is an example of Newton's 3rd Law? -
CORRECT ANSWERS The barbell doesn't fall through the floor due to
the reaction force
Which of the items listed below is an example of Newton's 2nd Law? -
CORRECT ANSWERS The acceleration for a 50kg barbell acted upon
by a force, is less than 10kg barbell acted upon with the same force magnitude
,Which of the items listed below is an example of Newton's 1st Law? -
CORRECT ANSWERS A barbell doesn't move from the floor until it is
acted on by an outside force
The principle of conservation of momentum is most accurately described by
which of the statements below? - CORRECT ANSWERS Momentum of
an object is neither gained nor lost unless it is acted on by a force
Energy by virtue of a body's position - CORRECT ANSWERS
Mechanical energy
Index of elasticity for colliding bodies - CORRECT ANSWERS
Coefficient of restitution
Resistance of a body to change from a state of rest - CORRECT ANSWERS
Inertia
Rate of work production - CORRECT ANSWERS Mechanical power
Energy of motion - CORRECT ANSWERS Mechanical energy
Resistance force acting opposite the direction of intended motion - CORRECT
ANSWERS Friction
Total magnitude of force applied to an object over a period of time - CORRECT
ANSWERS Impulse
The energy transferred to or from an object by a force acting over a distance -
CORRECT ANSWERS Mechanical work
,Quantity of motion possessed by a body - CORRECT ANSWERS
Momentum
The capacity to do work - CORRECT ANSWERS Mechanical energy
We know that most joints in the human body rotate in some fashion, but unless
we use an x-ray we can't really see the ends of the bones where this rotation
occurs. Which of the statements below BEST identifies where the center of
rotation can be found in a particular joint as it moves through its range of
motion? - CORRECT ANSWERS The center of rotation of the joint
changes due to the ellipsoid shape of the end of the bone
What type of motion is the predominant form of motion that occurs at human
joints during activities of daily living? - CORRECT ANSWERS Angular
motion
A rehabilitation patient is attempting to lift a carton off the floor as part of a
functional assessment for return to work. The Physical Therapist you are
working with wants to measure the angle of the thigh with respect to the
calf/shank (the knee) of the patient. Therefore the PT is interested in which of
the variables below? - CORRECT ANSWERS Angle of flexion of the
knee
As a projectile is thrown into the air, it is common to examine the overall
velocity of the object as well as the vertical and horizontal components of the
object's velocity.
1. This component of the projection velocity remains unchanged for the entire
time frame that the object is in the air?
2. This component of the projection velocity for the object constantly changes
due to gravity (and the air resistance that we are ignoring)? - CORRECT
ANSWERS Horizontal velocity; Vertical velocity
, Which of the statements below is accurate concerning a projectile? - CORRECT
ANSWERS The horizontal velocity of a projectile is constant
In order to help calculate and determine the initial linear velocity of a golf club
head at the moment it strikes the golf ball, you MUST convert the known
angular velocity of the golf swing (375 deg/s) into radians. What is the angular
velocity of the golf swing with the units in radians? - CORRECT ANSWERS
6.54 radians/s
My daughter decided to use some of her excess energy and climb a rock
climbing wall. Upon reaching to top (25 meters) she lets go of the wall in order
to fall straight back down. Fortunately for her, she is connected to a belay
(safety rope) that slowly lowers her back down. If she had not been connected
to a belay, using your knowledge about projectiles, calculate how long would it
have taken for her to free fall from the top of the wall to the floor below? -
CORRECT ANSWERS 2.26s
In the previous question, my daughter who is 30kg decided to climb a rock
climbing wall. Upon reaching to top (25 meters) she lets go of the wall in order
to fall straight back down. Fortunately for her, she is connected to a belay
(safety rope) that slowly lowers her back down. What was her Potential Energy
at the top of the rock climbing wall? - CORRECT ANSWERS 7,357.5J
In a Kinesiology softball game, Joe is playing Right Field and attempts to throw
out a runner, Jack, running to 2nd base. Joe throws the ball from Right Field and
it is caught at 2nd base by the shortstop. Joe releases the ball at a 36° angle at a
height of 2.18m with an initial velocity of 25.5 m/s. The shortstop catches the
ball at a height of 0.25m. Ignore air resistance.
What is the magnitude of the HORIZONTAL velocity of the ball at the moment
of release? - CORRECT ANSWERS 20.63 m/s
