levers

Question 1

what is a load

Answer 1

the weight or resistance of the lever arm

Question 2

what is the effort

Answer 2

the force of muscle contraction applied to move the lever

Question 3

what is the fulcrum

Answer 3

fixed point about which the lever moves

Question 4

what is the effort arm

Answer 4

• the distance between the effort and fulcrum

- perpendicular or right angle

Question 5

what is the load arm

Answer 5

• the distance between the load or the fulcrum

- perpendicular or right angle

Question 6

in a class 1 lever what is in the middle

Answer 6

fulcrum

Question 7

in a class 2 lever what is in the middle

Answer 7

load

Question 8

in a class 3 lever what is in the middle

Answer 8

effort

Question 9

example of a class 1 lever

Answer 9

pivot a neck heading ball
fulcrum- neck
load- head
effort- trapezius

Question 10

example class 2 lever

Answer 10

plantar flexion
F- ball of foot
L- body weight
E- gastrocnemius

Question 11

example class 3 lever

Answer 11

extension at knee
F- knee
L- lower leg
E- vastus medialis

Question 12

which class lever is most effective and why

Answer 12

class 2 
allows us to move big loads with small effort

Question 13

name a mechanical advantage

Answer 13

when the effort arm is longer than the load arm the large load is moved over a short distance requiring little force

Question 14

what is a disadvantage of a class3

Answer 14

they cannot lift heavy loads due to position of fulcrum in relation to effort and load