Question 1

In which of the following is torque not found?

Accepted Answer

A)  seesaws 
B)  bowling ball rolling down alley 
C)  linear motion 
D)  animals 
A)  seesaws 
B)  bowling ball rolling down alley 
C)  linear motion 
D)  animals C

Question 2

Why would a coach recommend a "tighter" tuck to enable a gymnast to get all the way around?

Accepted Answer

A)  angular velocity will decrease 
B)  angular displacement will decrease 
C)  moment of inertia will decrease 
D)  mass will decrease 
A)  angular velocity will decrease 
B)  angular displacement will decrease 
C)  moment of inertia will decrease 
D)  mass will decrease C

Question 3

Which of the following actions increase torque?
1) apply greater force
2) apply force at an angle closer to 90$\circ$
3) lengthen perpendicular distance between axis and point of application of force
4) shorten the force arm

Accepted Answer

A)  apply greater force AND shorten the force arm 
B)  apply greater force AND apply force at an angle closer to 90$\circ$ 
C)  apply force at an angle closer to 90$\circ$ AND lengthen perpendicular distance between axis and point of application of force AND shorten the force arm 
D)  apply greater force AND apply force at an angle closer to 90$\circ$ AND lengthen perpendicular distance between axis and point of application of force 
A)  apply greater force AND shorten the force arm 
B)  apply greater force AND apply force at an angle closer to 90$\circ$ 
C)  apply force at an angle closer to 90$\circ$ AND lengthen perpendicular distance between axis and point of application of force AND shorten the force arm 
D)  apply greater force AND apply force at an angle closer to 90$\circ$ AND lengthen perpendicular distance between axis and point of application of force D

Question 4

When doing an iron cross on the still rings the ideal position is for the gymnast to support the body with the arms abducted to 90$\circ$. Why do many gymnasts abduct only to 70$\circ$ on this move?

Accepted Answer

Question 5

What is the true effort arm (moment arm) of a lever in the body?

Accepted Answer

A)  distance from axis to point of attachment of muscle 
B)  distance from midpoint of muscle's line of pull to axis 
C)  perpendicular distance from axis to point of application of force 
D)  perpendicular distance from line of pull of muscle to axis 
A)  distance from axis to point of attachment of muscle 
B)  distance from midpoint of muscle's line of pull to axis 
C)  perpendicular distance from axis to point of application of force 
D)  perpendicular distance from line of pull of muscle to axis

Question 6

A machine that magnifies force does so at the expense of:

Accepted Answer

A)  velocity and speed 
B)  velocity and acceleration 
C)  displacement and torque 
D)  speed and range of motion 
A)  velocity and speed 
B)  velocity and acceleration 
C)  displacement and torque 
D)  speed and range of motion

Question 7

What is the effort (E) and what is the resistance (R) acting on the femur during flexion of the knee of the supporting leg when going down a step?

Accepted Answer

A)  E = concentric contraction of the hamstring, R = weight 
B)  E = concentric contraction of the vasti, R = weight 
C)  E = weight, R = eccentric contraction of the hamstrings 
D)  E = weight, R = eccentric contraction of the vasti 
A)  E = concentric contraction of the hamstring, R = weight 
B)  E = concentric contraction of the vasti, R = weight 
C)  E = weight, R = eccentric contraction of the hamstrings 
D)  E = weight, R = eccentric contraction of the vasti

Question 8

Why is it more difficult to perform a sit-up when the hands are clasped behind the head then when the arms are kept at the side?

Accepted Answer

A)  the resistance arm is greater 
B)  the resistance arm is smaller 
C)  the torque of the resistance is reduced 
D)  the torque produced by the abdominals is reduced 
A)  the resistance arm is greater 
B)  the resistance arm is smaller 
C)  the torque of the resistance is reduced 
D)  the torque produced by the abdominals is reduced

Question 9

What is meant by torque?

Accepted Answer

A)  ability of a force to overcome resistance 
B)  amount of force necessary to cause rotation 
C)  effective force producing rotary motion at an axis 
D)  relationship between force and resistance 
A)  ability of a force to overcome resistance 
B)  amount of force necessary to cause rotation 
C)  effective force producing rotary motion at an axis 
D)  relationship between force and resistance

Question 10

Will a subject who is seated be able to support more weight with the knee fully extended or with the knee at 20$\circ$ of flexion (lower leg 20$\circ$ below the horizontal)?
 Explain your answer, including a discussion of both the resistance and the effort.

Accepted Answer

decreased resistance

Question 11

Why is it easier for a runner to move his recovery leg forward more rapidly when it is flexed than when extended?

Accepted Answer

A)  mass of the leg is greater when it is flexed 
B)  mass of the leg is less when it is flexed 
C)  moment of inertia of the leg is greater when leg is flexed 
D)  moment of inertia of the leg is less when leg is flexed 
A)  mass of the leg is greater when it is flexed 
B)  mass of the leg is less when it is flexed 
C)  moment of inertia of the leg is greater when leg is flexed 
D)  moment of inertia of the leg is less when leg is flexed

Question 12

Why do sprinters lean when running the curve on a track?

Accepted Answer

weight act

Question 13

In which of the following will the least amount of force be necessary to overcome a 20 lb. resistance?

Accepted Answer

A)  angle of pull = 30$\circ$, effort arm = 3" 
B)  angle of pull = 45$\circ$, effort arm = 2" 
C)  angle of pull = 60$\circ$, effort arm = 4" 
D)  angle of pull = 120$\circ$, effort arm = 1" 
A)  angle of pull = 30$\circ$, effort arm = 3" 
B)  angle of pull = 45$\circ$, effort arm = 2" 
C)  angle of pull = 60$\circ$, effort arm = 4" 
D)  angle of pull = 120$\circ$, effort arm = 1"

Question 14

Why lift a heavy weight from the floor by flexing and then extending the knees rather than flexing at the hips and then lifting the trunk?

Accepted Answer

A)  longer lever 
B)  less force available 
C)  shorter resistance arm 
D)  smaller angle of pull 
A)  longer lever 
B)  less force available 
C)  shorter resistance arm 
D)  smaller angle of pull

Question 15

Why is it easier for a gymnast doing giant swings to stop in a handstand at the top of the bar than to stop in a long hang at the bottom of the bar?

Accepted Answer

angular mo

Question 16

Based on the principles of levers, which of the following levers is most efficient in overcoming a resistance of 20 lbs?

Accepted Answer

A)  EA = 2", RA = 4" 
B)  EA = 4", RA = 6" 
C)  EA = 10", RA = 5" 
D)  EA = 10", RA = 10" 
A)  EA = 2", RA = 4" 
B)  EA = 4", RA = 6" 
C)  EA = 10", RA = 5" 
D)  EA = 10", RA = 10"

Question 17

A ten-pound weight is held so that it can be moved in either direction by the biceps and triceps (e.g. arm abducted with flexion and extension in the horizontal plane). How much effort will the triceps need as compared to the biceps where the effort arm is 1 inch for the triceps and 2 inches for the biceps? The weight is held in the hand at a point 12 inches from the elbow.

Accepted Answer

A)  triceps 2 1/2 times as much as biceps 
B)  triceps 2 times as much as biceps 
C)  triceps same as biceps 
D)  triceps 1/2 as much as biceps 
A)  triceps 2 1/2 times as much as biceps 
B)  triceps 2 times as much as biceps 
C)  triceps same as biceps 
D)  triceps 1/2 as much as biceps

Question 18

Why is a second-class lever well adapted to moving heavy loads?

Accepted Answer

A)  axis is located between effort and resistance 
B)  effort is located between axis and resistance 
C)  effort arm is longer than resistance arm 
D)  resistance arm is longer than effort arm 
A)  axis is located between effort and resistance 
B)  effort is located between axis and resistance 
C)  effort arm is longer than resistance arm 
D)  resistance arm is longer than effort arm

Question 19

What is centrifugal force?

Accepted Answer

A)  force that causes object to fly off at a tangent to arc of motion 
B)  force that causes object to travel in an arc 
C)  reaction force to that which pulls away from center of arc 
D)  reaction force to centripetal force
Short Answer Questions 
A)  force that causes object to fly off at a tangent to arc of motion 
B)  force that causes object to travel in an arc 
C)  reaction force to that which pulls away from center of arc 
D)  reaction force to centripetal force
Short Answer Questions

Question 20

What does a machine with a resistance arm greater than a force arm favor?

Accepted Answer

A)  speed 
B)  force 
C)  acceleration 
D)  torque 
A)  speed 
B)  force 
C)  acceleration 
D)  torque

Exam 13: The Conditions of Rotary Motion

In which of the following is torque not found?

Why would a coach recommend a "tighter" tuck to enable a gymnast to get all the way around?

Which of the following actions increase torque? 1) apply greater force 2) apply force at an angle closer to 90 ∘\circ∘ 3) lengthen perpendicular distance between axis and point of application of force 4) shorten the force arm

When doing an iron cross on the still rings the ideal position is for the gymnast to support the body with the arms abducted to 90 ∘\circ∘ . Why do many gymnasts abduct only to 70 ∘\circ∘ on this move?

What is the true effort arm (moment arm) of a lever in the body?

A machine that magnifies force does so at the expense of:

What is the effort (E) and what is the resistance (R) acting on the femur during flexion of the knee of the supporting leg when going down a step?

Why is it more difficult to perform a sit-up when the hands are clasped behind the head then when the arms are kept at the side?

What is meant by torque?

Will a subject who is seated be able to support more weight with the knee fully extended or with the knee at 20 ∘\circ∘ of flexion (lower leg 20 ∘\circ∘ below the horizontal)? Explain your answer, including a discussion of both the resistance and the effort.

Why is it easier for a runner to move his recovery leg forward more rapidly when it is flexed than when extended?

Why do sprinters lean when running the curve on a track?

In which of the following will the least amount of force be necessary to overcome a 20 lb. resistance?

Why lift a heavy weight from the floor by flexing and then extending the knees rather than flexing at the hips and then lifting the trunk?

Why is it easier for a gymnast doing giant swings to stop in a handstand at the top of the bar than to stop in a long hang at the bottom of the bar?

Based on the principles of levers, which of the following levers is most efficient in overcoming a resistance of 20 lbs?

Why is a second-class lever well adapted to moving heavy loads?

What is centrifugal force?

What does a machine with a resistance arm greater than a force arm favor?

Introduction to the Study of Kinesiology

The Musculoskeletal System: The Skeletal Framework and Its Movements

The Musculoskeletal System: The Musculature

The Neuromuscular Basis of Human Motion

The Upper Extremity: The Shoulder Region

The Upper Extremity: The Elbow, Forearm, Wrist, and Hand

The Lower Extremity: The Hip Region

The Lower Extremity: The Knee, Ankle, and Foot

The Spinal Column and Thorax

Terminology and Measurement in Biomechanics

The Description of Human Motion

The Conditions of Linear Motion

The Center of Gravity and Stability

Kinesiology of Fitness and Exercise

Moving Objects: Pushing and Pulling

Moving Objects: Throwing, Striking, and Kicking

Locomotion: Solid Surface

Locomotion: The Aquatic Environment

Locomotion: When Suspended and Free of Support

Impact

Instrumentation for Motion Analysis

Filters

Which of the following actions increase torque? 1) apply greater force 2) apply force at an angle closer to 90^$\circ$ 3) lengthen perpendicular distance between axis and point of application of force 4) shorten the force arm

When doing an iron cross on the still rings the ideal position is for the gymnast to support the body with the arms abducted to 90^$\circ$. Why do many gymnasts abduct only to 70^$\circ$ on this move?

Will a subject who is seated be able to support more weight with the knee fully extended or with the knee at 20^$\circ$ of flexion (lower leg 20^$\circ$ below the horizontal)? Explain your answer, including a discussion of both the resistance and the effort.