Deck 5: Biomechanics of Resistance Training

Question 1

What is the motive force required to hold a 200-N dumbbell in the hand with the forearm horizontal if the mechanical advantage is 0.1?

A) 100 N
B) 400 N
C) 220 N
D) 2,000 N

Answer 1

D

Question 2

Momentum can best be defined as:

A) the speed of an object
B) the quantity of mass of an object
C) the quantity of motion of an object
D) an instant in time

Answer 2

C

Question 3

How much work is done in raising a 200-kg barbell mass a distance of 0.5 m?

A) 50 J
B) 100 J
C) 490 J
D) 980 J

Answer 3

D

Question 4

What is the formula for the calculation of torque?

A) T = F  d
B) T = F  a
C) T = m  a
D) T = N  m

Question 5

What does the symbol "g" represent?

A) gravitational weight force
B) gravitational acceleration
C) the mass of the earth
D) the coefficient of gyration

Question 6

According to the power-velocity relationship, the greatest mechanical power output is produced when the muscle is shortening at a velocity that is what percent of maximum.

A) 30%
B) 50%
C) 70%
D) 100%

Question 7

Which of the following is an example of a wheel-axle machine in the musculoskeletal system?

A) triceps extending the elbow joint
B) biceps flexing the elbow
C) quadriceps acting over the patella
D) pectoralis major internally rotating the humerus

Question 8

In biomechanics, what does the nomenclature SSC stand for?

A) supersonic car
B) super slow concentric
C) simultaneous slippage coefficient
D) stretch-shortening cycle

Question 9

What type of muscle action lengthens while the muscle is developing tension?

A) concentric
B) eccentric
C) isometric
D) isotonic

Question 10

What are the units of measurement of force?

A) meters
B) kilograms
C) newtons
D) joules

Question 11

At what percentage of a muscle's resting length is the muscle able to produce the greatest contractile tension?

A) 50%
B) 80%
C) 100%
D) 120%

Question 12

The point at which the strength curve and resistance curve converge is called the _____________.

A) equilibrium point
B) point of stability
C) impulse point
D) sticking point

Question 13

The newton.meter (N.m) is the SI unit for what mechanical quantity?

A) acceleration
B) linear impulse
C) angular momentum
D) torque

Question 14

Which class of lever is the biceps muscle flexing the elbow joint against resistance applied to the hand?

A) first class
B) second class
C) third class
D) the biceps can function as a first, second, and third class lever

Question 15

____________ is that state of a system which is not changing speed or direction.

A) stability
B) equilibrium
C) impulse
D) isotonic

Question 16

Variable resistance devices were developed to overcome the problem of the ___________ limiting the weight that could be lifted.

Question 17

The position of the gravity line relative to the edge of the base will determine how _______ the object is in that direction.

Question 18

The force produced because of the enormous size of the planet Earth attracting all objects around it is called ____________.

Question 19

Training machines that use the resistance produced when fluid is forced through a small aperture are called ____________ machines.

Question 20

Muscle can generate more tension during _________ contraction than during __________ contraction.

Question 21

Stability of a body is only affected by the size of the base of support and the mass of the body.

Question 22

Stability is the process by which a body's state of equilibrium is controlled for a given purpose.

Question 23

A body is balanced if its line of gravity falls outside its base of support.

Question 24

The center of gravity is an anatomical landmark that is fixed at one point in the body.

Question 25

The force that a muscle can exert increases with increasing speed of shortening.

Question 26

The effectiveness of a muscle's tension is greatest when the muscle's angle of attachment is greater than 90 degrees to the bone on which it pulls.

Question 27

The "line of resistance" in weight training is always directly downward and cannot be altered.

Question 28

Explain the arrangement of forces in a third-class lever?

Question 29

Explain the difference between an ascending and descending strength curve.

Question 30

Explain the concept of friction.