Identify which Core technology is represented by the examples below: December 6, 2009 DRILL U3d-L4 a.Door latche. Crankshaft b.Thermostatf. Cylinder c.Fang.

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Presentation transcript:

Identify which Core technology is represented by the examples below: December 6, 2009 DRILL U3d-L4 a.Door latche. Crankshaft b.Thermostatf. Cylinder c.Fang. Battery d.Light bulbh. Gas tank a.Mechanical b.Electronic c.Mechanical/Thermal d.Optical e.Mechanical f.Structural g.Electrical h.Structural

input U3d-L3

2. input U3d-L3

input 3. U3d-L3

4. input U3d-L3

5. input U3d-L3

input 6. input U3d-L3

U3d-L4 Machines are artifacts that transmit or change the application of power, force, or motion. What is an artifact? –something created by humans usually for a practical purpose. Machines can be simple or complex –Complex machines are comprised of…. Simple Machines

U3d-L4 Simple machines work on 2 basic principles: LEVER INCLINED PLANE Principle: a law of nature underlying the working of an artificial device

U3d-L4 3 Categories of simple machines based on the principle of the LEVER: LEVER LeverWheel and AxlePulley

Lever Arm Fulcrum Applied Force Load 3 different Classes of levers: U3d-L4 LEVER

Which is 1 st class? U3d-L4 1 st class: –The fulcrum is between the load and the effort force LEVER

Which is 2 nd class? U3d-L4 2 nd class: –The load is between the effort and the fulcrum LEVER

Which is 3 rd class? U3d-L2 3 rd class: –The effort is placed between the load and the fulcrum LEVER

U3d-L4 Notice the direction of motion of the Force and Load for each of the 3 classes of lever.

U3d-L4 Identify and sketch 3 common mechanical devices (not discussed in class during this lesson) that exhibit characteristics of the 3 classes of lever. For example: