1. Simple Machines Chapter 4 Section 3
Work & Machines
Simple Machines
Chapter 4
Section 3

2. Simple Machines
Inclined Plane Family
Lever Family

3. Lever Family
Simple Lever
Pulley
Wheel & Axle

4. Levers All have a rigid arm that moves on a fulcrum Wheel barrel
Teeter-totter

5. K’NEX Hammer
Increased di causes increased Fo

6. K’NEX Nut Cracker
Increased di causes increased Fo

7. K’NEX Scale Balance

8. Pulley A modified lever that uses a wheel instead of a fulcrum
Block & Tackle
Multiple pulleys put together as a single unit
Ex. Garage doors

9. Wheel & Axel A pulley (wheel) connected to a shaft (axle)
Steering wheel
Bigger = easier
Screwdriver handle
Thicker = easier

10. Inclined Plane Family
Simple Inclined Plane
Wedge
Screw

11. Simple Inclined Plane Changes magnitude & direction of the force Ramp
Decreases Finput
Increases dinput

12. Wedge Two modified incline planes, back-to-back Blade Splitting wedge
1 downward force
Turns into 2 outward forces
Blade
Splitting wedge
Nail

13. Screw An inclined plane wrapped around a cylinder Screws Jar lids
Spiral staircase

14. Compound Machine A machine that combines 2 or more simple machines
Scissors
Handles
2 levers
joined at a common fulcrum
Blades
2 wedges,