1.3a levers

Question 1

first class lever

Answer 1

E-F-L
extension of the neck when preparing to head a football

Question 2

second class lever

Answer 2

E-L-F
ball of the foot when pushing off the ground in a step in rugby

Question 3

third class lever

Answer 3

F-E-L
flexion of the elbow when catching rugby ball and bringing into chest

Question 4

what are the 2 main functions of levers?

Answer 4

-generate muscular effort to overcome given load

-increase speed of a given movement

Question 5

what is the load?

Answer 5

weight or resistance

Question 6

what is the effort?

Answer 6

muscular force applied at the insertion

Question 7

what is the fulcrum?

Answer 7

joint

Question 8

what is the effort arm?

Answer 8

distance from fulcrum to effort

Question 9

what is the load arm?

Answer 9

distance from load to fulcrum

Question 10

what advantage does a greater effort arm have over the load arm?

Answer 10

large load can be moved with relatively small effort
(over a small range of motion)

eg 2nd class lever in ankle

Question 11

what mechanical disadvantage does a greater load arm have over the effort arm?

Answer 11

large effort required for a relatively small load

eg 3rd class lever in bicep curl

Question 12

how to remember order of classes?

Answer 12

F
L
E
(letter in middle)