Levers Flashcards
(26 cards)
What phrase is used to remember the Levers?
FLE —> 123
What is the first-class lever?
The Fulcrum (pivot) is between the effort and load
Give an example of where the first-class lever is used around the bogy
Head
When the head and neck are being flexed like nodding
Give a sporting example of when a first-class lever is used
Header in football
What shape is the load in a diagram?
Square (box)
What shape is the fulcrum in a diagram?
Triangle
What shape is the effort in a diagram?
Arrow
What is the second class lever?
The load is in between the fulcrum and the effort
Give an example of where the second class lever is used around the body
Toes
Give a sporting example of where the second class lever is used
Netballer defending in netball
What is the third class lever?
The effort is inbetween the fulcrum and the load
Give an sporting example of where the third class lever is used
A boxer performing a bicep curl
What is special and ineffecent in a third class lever?
In terms of applying force this is a very inefficient lever but it allows speed and a range of movement
Does the first class lever have a high or low mechanical advantage?
LOW
Why does the first class lever have a low mechanical advantage?
Because the lever arm is longer than the effort
How can the first class lever have a high or low mechanical advantage?
depending on whether or not the fulcrum id closer to the load or effort
What is mechanical advantage?
A way of measuring the effecenty of the lever (bone)
How do you calculate mechanical advantage?
Effort arm / Load arm
What is the distance from the load to the fulcrum?
Load arm / Resistance arm
What is the distance fromthe effort to the fulcrum known as?
Effort Arm
When a lever’s effort arm is longer than its load arm it is said to have a what?
High mechanical advantage
Does the second class lever have a high or low mechanical advantage?
HIGH
Why does the second class lever have a higher mechanical advantage?
Because the effort arm is always longer than the load arm
Does the hird class lver have a high or low mechanical advantage?
LOW
