1. Simple Machines

2. Simple Machines
Simple Machine – a mechanical device that changes the direction of force
One of the simplest mechanisms that provide a mechanical advantage (leverage)
Can be combined with other simple machines to make a more complicated machine

3. Levers
simple machines that consists of a beam or rigid rod that is pivoted at a fixed hinge, or fulcrum
What does that look like?

4. Levers
Effort Point
Load
Fulcrum

5. Levers Fulcrum – The pivot point
Load – The object, or resistance, that is being moved
Effort Point – Place where you apply a force to move the load

6. Types of Levers
First Class
Second Class
Third Class

7. Types of Levers First Class Levers
Fulcrum is between the effort and the load
Examples
Seesaw

8. Second Class Levers Load is between the fulcrum and the effort
Examples
Wheelbarrow

9. Type of Levers Third Class Levers
effort is between the fulcrum and the load
Examples
Tweezers

10. Inclined Plane Most simple of all simple machines (NOTHING MOVES!!!)
Helps move the resistance to a higher level by reducing the amount of effort needed to move it.

11. Inclined Plane
1 part
Ramp

12. Inclined Plane
Examples
Steep driveway
Wheel chair ramp

13. Wedge
A wedge is really an inclined plane turned on its side that helps you split things apart
LADIES, if you tell me this is a wedge, I promise you will not get it right on the test!

14. Wedge
1 Part
Block of something cut in half…AKA an inclined plane…

15. Wedge
Examples
Axe
Not Axe!!

16. Screw
Made from an inclined plane that twists and has a wedge at its tip

17. Screw
Parts
Inclined plane
wedge

18. Screw Can you think of any other than a screw? Light Bulb base
Corkscrew

19. Ze Wheel and Ze Axle
A simple machine that reduces effort by reducing the amount of friction created by an object.

20. Wheel and Axle
2 parts
Wheel – Reduces surface area which reduces friction which reduces effort
( surface area, friction, effort)
axle – Attaches the wheel to the load

21. Wheel and Axle
Load
Wheel
axle

22. Wheel and Axle
Examples?
Steering Wheel
Mouse wheel

23. Pulleys
Modified wheel and axle that changes the direction of effort to work with gravity
Wheel and axle with a rope or chain attached to it

24. Pulleys

25. Pulleys Effort can be decreased by adding more pulleys!
If you have two pulleys, you will only do ½ the effort
3 pulleys = 1/3 the effort
4 pulleys = ¼ the effort so on and so fourth
Trade off is that for every pulley you add, you increase the distance the rope has to move by that number

26. Pulleys
Examples
Flag Pole
Crane