levers Flashcards
what is the Flucrum?
fixed pivot point (triangle)
what is the Effort?
the source of entertainment that will do work (arrow)
what is the Load?
the weight/resistance (square)
what is the for the different lever classes
FLE123
describe a first class lever
seesaw action, fulcrum in the middle, change direction of effort force, example: neck pivot joint flexed and extended -nodding
what is a lever arm?
the bone (straight line)
describe a second class lever
load in the middle, wheelbarrow, increase effect of effort force, example: long jumper taking off
describe a third class lever
effort in the middle, used to increase speed or range of movement, fishing rod, example: bicep curl during flexion
two main benefits of lever systems
large loads can be moved with relatively small effort
the distance a load can be moved or the speed it moves can increase without an increase in effort
what is a mechanical disadvantage
load arm is longer than effort arm, 3rd class, gaining speed and distance, a kick-little movement of hip=greater kick
what is a mechanical advantage
effort arm is longer than load arm, 2nd and some 1st class, small effort lifting heavier loads, example is long jumper taking off
why is a mechanical disadvantage important in sport?
take a small movement near the fulcrum and create a greater movement
what is a plane?
imaginary line or surface that divides the body into two, movement occurs in a plane
what is an axis?
imaginary line around or about which the whole body can turn around
name the acronyms of all the plans and axes (penguins)
Fat Penguins Sweat A lot
Tidy Penguins Vacuum A lot
Smelly Penguins Fart A lot
