1. Simple Machines
All mechanical devices consist completely of two machines:
Lever
Incline
The purpose of any machine is to make Work easier for humans to move a load
Work is conserved (kinda how Energy is conserved)
The Work you do on a machine can only equal the Work the machine does on the load
The benefit of a simple machine is to change the direction and/or amount of the FORCE!!!!!!!

2. Levers There are 3 classes of levers:
Class 1- See left
Fulcrum in middle
Class 2
Class 3
A Lever consists of, well, the lever, and these 3 parts:
Effort
Fulcrum
Load
Effort
Load
Effort
Fulcrum
Load
Load
Effort
Fulcrum
Fulcrum

3. Inclines The basic incline is a ramp (duh)
You use a small force over a greater distance
The incline uses a greater force over a smaller distance
Load
Effort

4. Parade of Machines Pulley Wheel & Axle Gear
These are types of LEVERS, believe it or not!
Screw
Wedge
These are types of INCLINES

5. Mechanical advantage

6. Trebuchet: a “simple” Machine
What type of machine:
LEVER first class!

7. At each station, find: Calculate: AMA Force In IMA Force Out
Distance In
Distance Out
Calculate:
AMA
IMA
The efficiency of the machine:
AMA =
IMA =