ch. 2 - Levers

Question 1

first class lever

Answer 1

muscle force and resistive force act on opposite sides of the fulcrum

Question 2

example of first class lever

Answer 2

forearm - elbow ext against resistance (tricep ext)

Question 3

second class lever

Answer 3

muscle force and resistive force act on same side of the fulcrum

moment arm longer

Question 4

MA for second class lever

Answer 4

> 1

Question 5

example of second class lever

Answer 5

plantarflexion against resistance (calf raise)

Question 6

third class lever

Answer 6

muscle force and resistive force act on same side of fulcrum

moment arm shorter

Question 7

MA for third class lever

Answer 7

< 1 ; muscle force must be greater than resistive force to produce torque

Question 8

example of third class lever

Answer 8

elbow flexion against resistance