test: levers

Question 1

what are the 4 parts to a lever?

Answer 1

lever arm, fulcrum, effort and load

Question 2

what acts as the lever arms?

Answer 2

bones

Question 3

what acts as the fulcrum?

Answer 3

joints

Question 4

what acts as the effort?

Answer 4

muscles

Question 5

what acts as the load?

Answer 5

weight/forces that are needed to lift, push or pull things

Question 6

what is in the middle in a first class lever?

Answer 6

fulcrum

Question 7

whats a practical example of a first class lever?

Answer 7

when the head and neck are being flexed or extended

e.g. heading a football

Question 8

what is in the middle of a second class lever?

Answer 8

load

Question 9

what is a practical example of a second class lever?

Answer 9

plantarflexion of the ankle when taking off in a long jump

Question 10

what is in the middle of a third class lever?

Answer 10

effort

Question 11

what is a practical example of a first class lever?

Answer 11

upwards phase of a bicep curl

Question 12

what class is flextion of the elbow?

Answer 12

3rd

Question 13

what class is extension of the elbow?

Answer 13

1st

Question 14

what is the effort arm?

Answer 14

the distance from the fulcrum to the effort

Question 15

what is the load arm?

Answer 15

distance from the load to the fulcrum

Question 16

what is mechanical advantage? and what class if levers have it?

Answer 16

when large loads can be moved with small effort

second class lever

Question 17

what is mechanical disadvantage? and what levers have it?

Answer 17

a large amount of effort is required to move a relatively small load

first class and third class