PPT 2-6

Question 1

Stress

Answer 1

Amount of force (load) on a material

Question 2

Strain

Answer 2

Amount of give (flex, bend, lengthening, deformation) that occurs in response to stress

Question 3

CT response to lack of stress? Leads to?

Answer 3

-Immobilization, disuse, lack of WB
-loss of CT strength, loss of PG, irregular pattern of collagen cross linking

Question 4

Extensibility

Answer 4

Able to stretch

Question 5

Elasticity

Answer 5

Able to recoil to original resting length

Question 6

Sarcomere

Answer 6

Basic contractile unit of muscle fiber

Question 7

Torque

Answer 7

Perpendicular force x length of lever arm (measured in foot pounds)

Question 8

Type 1 muscle fibers

Answer 8

-slow twitch
-aerobic exercise/long periods of time
-fat, protein, and carbs for energy
-use lots of O2 and produce little lactic acid

Question 9

Type 2 muscle fibers

Answer 9

-anaerobic exercise
-ATP or glucose for fuel, consume little O2
-produce a lot of lactic acid

Question 10

Force velocity curve

Answer 10

Inverse relationship between speed of contraction and force generated

Question 11

Class 1 lever

Answer 11

Fulcrum in the middle, effort and load on either side going down (see saw)

Question 12

Class 2 lever

Answer 12

Fulcrum at the end, load in middle going down, effort at the end going up (wheel barrow or heel raise)

Question 13

Class 3 lever

Answer 13

Fulcrum at the end, effort in the middle going up, load at the end going down (bicep curl)

Question 14

Newton’s 1st Law

Answer 14

Body at rest will remain at rest, and a body in uniform motion will remain in motion until an outside force acts upon it (law of inertia or equilibrium)

Question 15

Newton’s 2nd Law

Answer 15

Acceleration of an object depends on mass and net force acting on it.