Topic 2.1- Lever Systems Flashcards
What is the definition of Effort?
What is the definition of Fulcrum?
What is the definition of Load and what is this usually?
What is the make up of a first class lever?
Where is the fulcrum in a first class lever?
What is the make up of a second class lever?
Where is the fulcrum in a second class lever?
The force that is applied by the user of the lever
The pivot joint, the lever rotates around this
The force that is applied by the lever system (usually gravity)
EFL
The fulcrum is between the effort and the load
ELF
The fulcrum is at the end.
What is the make up of a third class lever?
Where is the fulcrum in a third class lever?
Which class of levers are most levers in the body?
What is the mechanical advantage of first and second class levers?
What are the two mechanical disadvantages of third class levers?
What are the three advantages of both first and second class levers?
What are the two disadvantages of both first and second class levers?
FEL
The fulcrum is at the start of the system
Third class
The output is greater than the input
- The effort and load are on the same side of the fulcrum
- The input is greater than the output
They are both stable and by increasing the length of lever arm increases mechanical advantage
They are both slow and have limited flexibility.
What are the three advantages of third class levers?
What is the disadvantage of third class levers?
What is the definition of torque?
What is the definition of moment arm?
It has fast movement, large range of motion and by increasing the length of the lever arm decreases the mechanical advantage
The force applied must always exceed the load
A force that tends to cause rotation (the ability of a force to cause rotation on a lever)
The length between a joint axis and the line of force acting on that joint.
