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
what is the frontal plane?
divides between front and back
what is the transverse plane?
divides between Top and bottom
what is the Sagittal Plane?
divides right to left (side to side)
what is the Sagittal axis?
front to back (cartwheel)
what is a vertical axis?
top to bottom (twist) ballet
what is a frontal axis
right to left (somersault)
what axis goes w the frontal plane
sagittal
what axis goes with transverse plane
vertical axis
what axis goes with sagittal plane
frontal axis
what is the effort arm
space between the fulcrum and effort
what is a lever
a solid bar that moves about a fixed point when a force is applied to it
what is the load arm
space between fulcrum and load
