1. Simple Machines
Chapter 6

2. “The perplexity of life arises from there being too many interesting things in us to be interested properly in any of them”
-G.K. Chesterton

3. Read p.88-89

4. Machine
a device that changes the amount or direction of the force needed for work
6 main types

5. Inclined Plane
a simple machine that allows us to raise objects little by little instead of all at once

6. Screw
A special type of inclined plane that can convert a rotational movement into a vertical movement
A screw is a spiral inclined plane

7. Wedge
a simple machine made out of two inclined planes placed back to back

8. Lever A long board or rod that rotates around a fulcrum
Fulcrum: a sturdy object or surface that the board rotates around
3 types of levers

9. First Class Lever
A lever in which the fulcrum is between the force and the load

11. Second Class Lever
Levers in which the load is between the force and the fulcrum
Increase force, does not change direction

13. Third Class Lever A lever in which the force is
in the middle of the fulcrum
and the load
Multiply distance

16. What type of lever is this?

17. Wheels Friction: the drag when objects move across each other
Rolling wheel: decreases the amount of friction (drag) involved in work

18. Wheel and Axle
A simple machine made of a wheel firmly attached to a rod (axle)
Force is applied to the wheel

20. Reverse Wheel and Axle
The force is applied to the axle

21. Pulley A wheel in a frame
Can change the direction of the force or the amount of force

23. 4 types of pulleys Changes the direction & decreases amount of force
Changes direction of force
Decreases the amount of force