Levers Flashcards
What does a mechanism do?
Creates movement within a product
What are the four types of movement?
Rotating
Linear
Reciprocating
Oscillating
What is rotating movement?
Turning in a circle
What is Linear movement?
Moving straight in one direction
What is Reciprocating movement?
Moving backwards and forwards
What is Oscillating movement?
Swinging in alternating directions
What is a lever?
Simple device, consisting of a rigid bar which pivots about a fixed point (fulcrum)
How do levers work?
Load applied at one end of a rigid bar
Bar is placed centrally on top of fulcrum
At other end of bar a force is applied (effort)
Results in single lever movement
What can be affected by altering the position of the fulcrum?
The effort can be multiplied and a larger load can be lifted by a first class level = mechanical advantage
Where is the fulcrum?
Between the load and the effort
Why is the effort needed less than the load?
Because the load is nearer to the fulcrum (For both first class and second class levers)
What is a second class lever?
Where the load is applied between the effort and the fulcrum
What is third class lever?
Where the effort is applied between the load and the fulcrum
What does it mean that the effort needed is greater than the load for a third class lever?
The amount of movement of the load is multiplied
