levers

Question 1

what is a lever?

Answer 1

a mechanical device in which effort force causes the rotation of bones about a fixed point (joints)

Question 2

what’s a first class lever?

Answer 2

fulcrum lies between the effort and the load

Question 3

what’s a second class lever?

Answer 3

load lies between the effort and fulcrum

Question 4

what’s a third class lever?

Answer 4

effort lies between the load and fulcrum

Question 5

in the human body, what represents the effort, load and fulcrum?

Answer 5

effort= muscles
load= bones
fulcrum= joints

Question 6

what is the effort arm in a lever system?

Answer 6

the distance between the fulcrum and the effort in a lever system

Question 7

what is the load arm in a lever system?

Answer 7

the distance between the fulcrum and the load in a lever system

Question 8

what are the two examples of a first class lever?

Answer 8

extension at the neck
extension at the elbow

Question 9

what’s the mechanical advantage of a lever system?

Answer 9

when the effort arm is longer then the load arm enabling it to overcome heavy loads

Question 10

what’s the mechanical disadvantage of a lever system?

Answer 10

when the load arm is longer then the effort arm allowing the lever to move quicker

Question 11

what’s the only example of a second class lever?

Answer 11

ankle during plantar flexion