1. Simple Machines
Notes for 14.4

2. IMPORTANT TO REMEMBER:
What type of machine it is depends on how you are using it!

3. 6 Types of Simple Machines
Lever
Wheel and Axle
Inclined Plane
Wedge
Screw
Pulley

4. All Levers Have 3 Parts
Input Arm – distance between input force and fulcrum
Output Arm – distance between output force and fulcrum
Fulcrum – Fixed point lever rotates around

5. Classes of Levers
First-Class Lever: Fulcrum located between input force and output force
Second-Class Lever: Output force is between input force and fulcrum
Third-Class Lever: Input force is located between fulcrum and output force

6. First- Class
Second-Class
Third-Class

7. Identify these types of levers:
Output 2.
Input 1.
Output
Input
Second-Class
Third-Class 4.
Input 3.
Output
Output
Input
First-Class
First-Class

8. Wheel and Axle
2 Disks or cylinders, each with a different radius (they are different sizes)
Ex: Car steering wheels and screwdrivers

9. Inclined Planes
Slanted surface on which force moves an object to a different elevation
Reduces effort (input) force by increasing distance
Ex: Ramps, stairs, mountain roads

10. Wedge
Wedge - V shaped object whose sides are 2 inclined planes sloped toward each other
Ex: ax, knife blade, and zipper

11. Screws
An inclined plane wrapped around a cylinder

12. Pulleys
Has a rope that fits into a groove in a wheel

13. 3 Types of Pulleys Fixed – A wheel attached in a fixed location
Movable – Attached to object moved
Pulley System – Combines fixed and movable pulleys

14. What types of pulleys are these?B. C. A.

15. Compound Machine Combines 2 or more simple machines
Ex: bicycle, car, clock, and washing machines