NCSF Biomechanics

Question 1

The rate, or a measure of the rate, of motion

Answer 1

Velocity

Question 2

How quickly a position changes.

Answer 2

Speed

Question 3

The capacity to do work.

Answer 3

Energy

Question 4

Time rate of doing work or (Force x Distance)/Time

Answer 4

Power

Question 5

The energy possessed by a body because of its motion.

Answer 5

Kinetic Energy

Question 6

A change in the velocity of an object.

Answer 6

Acceleration

Question 7

Transfer of energy by a force acting to displace a body

Answer 7

Work

Question 8

The turning effect created by a force about an axis

Answer 8

Torque

Question 9

A unit of power in the International System of Units equal to one joule per second.

Answer 9

Watt

Question 10

Energy stored by an object by virtue of its position

Answer 10

Potential energy

Question 11

Change in position that occurs when all points on an object move the same distance, in the same direction, and at the same time.

Answer 11

Linear motion

Question 12

Mass of an object times the linear velocity of the object

Answer 12

Linear momentum

Question 13

A single sided or unbalanced load

Answer 13

Asymmetrical load

Question 14

A stable state characterized by the cancellation of all forces by equal, opposing forces.

Answer 14

Balance

Question 15

The distance between the fulcrum and the point of resistance

Answer 15

Resistance Arm

Question 16

A group of body segments connected by joints so that the segments operate together to provide a wide range of motion for a limb

Answer 16

Kinetic Chain

Question 17

The role of a muscle whose torque opposes action

Answer 17

Antangonist

Question 18

Role of a muscle whose torque aids the action, often referred to as the prime mover

Answer 18

Agonist

Question 19

Name two internal forces that act on a body

Answer 19

1. Tensile

2. Compressive

Question 20

Name two external forces that act on a body

Answer 20

1. Contact

2. Frictional

Question 21

General motion is a combination of which two classifications of motion.

Answer 21

Angular

Linear

Question 22

If the starting position is known, a particular motion can be quantified by:

Answer 22

Speed

Velocity

Question 23

In weightlifting, positive work is known as:

Answer 23

Concentric Contraction

Question 24

In weightlifting, negative work is known as;

Answer 24

Eccentric Contraction

Question 25

Power output is dependent upon which two factors?

Answer 25

Quantity of Power

Time it is sustained

Question 26

List three variables that can be manipulated to achieve bodily stability:

Answer 26

1. Base of support
2. Height of the center of gravity
3. Line of gravitational pull

Question 27

What are the four components that make up the inner unit of the lumbopelvic region?

Answer 27

1. Transverse abdominis
2. Pelvic floor
3. Multifidus
4. Diaphragm

Question 28

What is the primary stabilizer for the lumbopelvic region?

Answer 28

Transverse abdominis

Question 29

The amount of rotational inertia produced is dependent upon which three factors?

Answer 29

1. Total mass
2. Distribution of the mass
3. Angular velocity

Question 30

When swimming, water is an example of what kind of resistive force?

Answer 30

Contact Force

Question 31

The concentric phase of a military press is an example of which of the following:

a. Negative work
b. Positive work
c. Potential Energy
d. Frictional force

Answer 31

B. Positive work

Question 32

Which of the following has the greatest effect on a measured power output?

a. Muscle initial length
b. Neutralizing properties
c. Contractile velocity
d. Locations of the center of gravity

Answer 32

C. contractile velocity

Question 33

Leg lifts are contraindicated due to:

a. the resistive torques place excessive stress on the rectus abdomens
b. the cervical spine may become strained
c. the hip flexors cause anterior pull on the spine leading to disc compression
d. the pelvis is pulled into a posterior tilt

Answer 33

C

Question 34

What is a common biomechanics problem caused by performing the leg press exercise with tight hip extensors?

a. Pelvis migrates into a posterior pelvic tilt
b. The knees are forced past the toes
c. Cervical spine stress occurs due to neck flexion
d. All of the above

Answer 34

A