1. PDN
We use Simple Machines every day. Some in daily tasks and even some in sports that we play. Write a short paragraph describing a recent time you used a Simple Machine (Recall from the Machines packet you read from).

2. The Development of Simple Machines

3. Objectives
Identify systems having mechanical operations and explain their function.(Explain how all the simple machines work)
Be able to tell the difference between the 3 classes of levers.
Be able to tell the difference between the different types of common gears.

4. Machines
Can be as simple as a knife,

5. Machines
a bottle opener,

6. Machines
or a claw hammer.

7. Machines
A Machine is a device that does some kind of work by changing or transmitting energy. We use a machine to give us a mechanical advantage to make work easier to accomplish.

10. A shaduf, also spelled Shadoof,  hand-operated device for lifting water, invented in ancient times and still used in India, Egypt, and some other countries to irrigate land.

11. Shadoof or Shaduf

12. What is a Lever? Mocomi Kids

13. Difference between 2nd and 3rd Levers
2nd = Effort is at the END
EFFORT then LOAD/RESISTANCE then FULCRUM
3rd = Effort is BETWEEN
LOAD/RESISTANCE then EFFORT then FULCRUM

14. Let’s take a short quiz
Take out a sheet of paper and put your name on it.
You may use your notes to a identify the following class of levers. For each question, write down whether picture represents a first, second or third class lever.

15. #1

16. #2

17. #3

18. #4

19. #5

20. #6

21. #7

22. #8

23. #9

24. #10

27. Wheel and Axel
Mocomi Kids

28. Wheel and Axel
The Wheel and Axel helps us move heavy loads with less effort and reduced friction, thus giving us a mechanical advantage.

32. Wheel and Axel
The steam turbine concept was created or derived from the wheel and axel principle to give engineers a mechanical advantage.

33. Pulleys
Mocomi Kids

34. Pulley definition
A pulley is a wheel on an axle that is designed to support movement and change of direction of a cable or belt along its circumference. Pulleys are used in a variety of ways to lift loads, apply forces, and to transmit power.

35. Simple Pulley Systems

38. Incline Plane
Mocomi Kids

42. Incline Plane Definition
An Incline Plane is a ramp that assists in moving heavy objects up and down heights. The longer the distance of an incline plane, the less effort is needed.

44. Wedge
Mocomi Kids

48. Wedge Definition
Based on the Incline Plane, a wedge separates an object, lift a heavy load or keeps an object from moving. All in in an effort to gain a mechanical advantage.

50. Screw
Mocomi Kids

51. Screws

55. Screw Definition
A simple machine of the inclined plane type consisting of a spirally grooved solid cylinder and a correspondingly grooved hollow cylinder into which it fits.

57. Gears
A rotating machine part having cut teeth, which mesh with another toothed part to transmit torque. Two or more gears working in tandem can produce a mechanical advantage.
Basic and Compound Gears

60. In your Journal, please draw and label each of the main types of Gears
In your Journal, please draw and label each of the main types of Gears. When finished, have Mr. Klingaman check your work for a journal stamp.

61. Compound Gear Train

62. Bevel Gears

63. Spur Gears

64. Helical Gears

65. Worm and Wheel

66. Rack and Pinion

67. Rear differential in a Volvo 740
Some gears can be hybrids
What kind of gears do you see?

68. The study of liquids under pressure
Hydraulics
The study of liquids under pressure

69. Hydraulic Brake Video

70. The study of pressure in gases
Pneumatics
The study of pressure in gases

71. Pneumatic Brakes