Levers Flashcards
Draw the 1st class?
– the fulcrum is in the middle of the effort and the load.
Draw the 2ed class?
the load is in the middle between the fulcrum and the effort.
Draw the 3ed class?
the effort is in the middle between the fulcrum and the load.
Where is the 1st class lever found?
In the neck
Sporting example of 1st class lever?
raising your head to head a football
What is the fulcrum, effort, load of 1st class lever?
The neck muscles provide the effort, the neck is the fulcrum, and the weight of the head is the load.
Where 2ed class lever found?
ankle area
Sporting example of 2ed class lever?
take off in long jump
What is the fulcrum, effort, load of 1st class lever?
the ball of the foot acts as the fulcrum, the weight of the body acts as the load and the effort comes from the contraction of the gastrocnemius muscle.
Talk about the mechanical advantage in 1st class lever
The load arm is shorter than the effort arm, so there is a mechanical advantage, but then there is slow movement and limited flexibility.
Talk about the mechanical advantage in 2ed class lever
The load arm is shorter than the effort arm, so there is a mechanical advantage, but then there is slow movement and limited flexibility.
Talk about the mechanical disadvantage in 3ed class lever
The load arm is longer than the effort arm, so there is a mechanical disadvantage, but then there is fast movement and wage range of flexibility.
What is the fulcrum, effort, load of 3ed class lever?
the fulcrum is the elbow joint, the effort comes from the biceps contracting and the resistance is the weight of the forearm and any weight that it may be holding.
Example of a 3ed class lever
bicep curl
