4. WHAT IS A LEVER?
A lever is a simple machine made of a rigid beam and a fulcrum.
The effort (input force) and load (output force) are applied to either
end of the beam. The fulcrum is the point on which the beam
pivots. When an effort is applied to one end of the lever, a load is
applied at the other end of the lever.
5. HOW A LEVER WORKS!
The fulcrum (pivot): This is the part where the lever will
balance or turn.
Load: This is the object that is being moved or lifted.
Effort: This is the force that is used to move the load or the
resistance with a board, a handle or a bar that you can
push or pull.
When you push down with a force on one end of the lever,
you are putting in effort. The effort you put in will cause the
other side of the lever to lift, causing whatever was on the
other side to lift or move. The weight of the object you are
trying to move is the load. A small effort can move a large
load when you use a lever
7. FIRST CLASS
The Fulcrum Is In The Middle Of
The Effort And The Load. This
Type Of Lever Is Found In The
Neck When Raising Your Head-To-
Head A Football. The Neck
Muscles Provide The Effort, The
Neck Is The Fulcrum, And The
Weight Of The Head Is The Load.
• The Load Is In The Middle Between The Fulcrum
And The Effort. This Type Of Lever Is Found In The
Ankle Area. When Standing On Tiptoe, 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.
• The Third-class Lever Differs From
The Second-class Lever In That The
Distribution Of Forces Is Changed In
Relation To The Fulcrum. In Third-
class Levers, The Fulcrum Remains At
One End Of The Beam—however, The
Force Of The Effort Is Now Located
Between The Fulcrum And The Force
Of The Load..