Identify which Core technology is represented by the examples below:

December 6, 2009

DRILL

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a. Door latch e. Crankshaft

b. Thermostat f. Cylinder

c. Fan g. Battery

d. Light bulb h. Gas tank

a. Mechanical

b. Electronic

c. Mechanical/Thermal

d. Optical

e. Mechanical

f. Structural

g. Electrical

h. Structural

input input input

input input

2. 3. 4.

5. 6.

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2.

input input

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inputinput

3.

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4.

input input

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5.

input input

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input

6.

input

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• 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

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• Simple machines work on 2 basic principles:

LEVER

INCLINED PLANE

Principle: a law of nature underlying the working of an artificial device

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• 3 Categories of simple machines based on the principle of the LEVER:

LEVER

Lever Wheel and Axle

Pulley

• Lever Arm • Fulcrum• Applied Force• Load• 3 different Classes of levers:

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LEVER

Which is 1st class?

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• 1st class:– The fulcrum is between the load and the effort force

LEVER

Which is 2nd class?

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• 2nd class:– The load is between the effort and the fulcrum

LEVER

Which is 3rd class?

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• 3rd class:– The effort is placed between the load and the fulcrum

LEVER

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• Notice the direction of motion of the Force and Load for each of the 3 classes of lever.

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• 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: