levers Flashcards
what is the effort arm
the perpendicular distance between the effort and the fulcrum
what is the load arm
perpendicular distance between the load and the fulcrum
what rhyme helps remember lever systems
123, FLE
draw a 1st class lever system
give an example of a 1st class lever
extension of the elbow
draw a 2nd class lever system
give an example of a 2nd class lever
plantar flexion
describe the advantages of the 2nd class lever system
- effort arm is greater than laod arm
- so little effort needed to move a large load
- called mechanical advantage
decsribe the disadvantages of the 2nd class lever system
- there is small range of movement
- difficult to generate dinstance and speed
evaluate the 2nd class lever system
+ effort arm is greater than the load arm so little effort is need to move a large load (mechanical advantage)
- there is a small range of movement so is difficult to generate distance and speed
describe the features of the 2nd class lever system
mechanical advantage ( can generate strength)
draw the 3rd class lever system
give an example of the 3rd class lever system
bicep curl
flexion of elbow when catching ball
describe features of 3rd class lever system
mechanical disadvantage (can generate speed and distance)
