Chapter 2

Question 1

FA

Answer 1

Force applied to lever

Question 2

MAF

Answer 2

Moment arm of applied force

Question 3

FR

Answer 3

Force resisting the lever’s rotation

Question 4

MRF

Answer 4

Moment arm of resistive force

Question 5

First Class Levers

Answer 5

Triceps, muscle force and resistive forces are on opposite ends of fulcrum

Question 6

Second Class Levers

Answer 6

Calves, FA and FR are on same side of fulcrum. MAF longer than MRF

Question 7

Third Class Levers

Answer 7

Biceps, Same side of fulcrum. MRF longer than MAF

Question 8

Patella

Answer 8

Increases MA of quads by keeping quad tendon farther from knee axis of rotation

Question 9

Tendon Insertion

Answer 9

Farther from joint = greater MA and ability to lift but reduces speed

Question 10

Biomechanics Factors in Strength

Answer 10

Neural Control
Muscle Cross Sectional Area
Arrangement of Muscle Fibres
Muscle Length (stretched, contracted are less potential)
Joint Angle
Contraction Velocity

Question 11

Resistance to Muscle Contraction

Answer 11

Gravity (less resistance closer to joint)
Inertia
Friction
Fluid Resistance
Elasticity