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Section 3

Section 3. Science, society, and the environment are all important in the development of mechanical devices and other technology. 3.1- Evaluating Mechanical Devices. Mechanical devices have evolved over time because of new developments in science and technology. We go from this

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Section 3

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  1. Section 3 Science, society, and the environment are all important in the development ofmechanical devices and other technology

  2. 3.1- Evaluating Mechanical Devices • Mechanical devices have evolved over time because of new developments in science and technology. We go from this to..... http://www.youtube.com/watch?v=ff1EGEl3ROs

  3. Using Criteria to Evaluate a Device • Lets say your old bicycle has broken down..you need to buy a new one. How do you decide which one to buy? • Are you going to use it for BMX riding? • Ride it to school? • Riding after dark? • Take a look at pg. 305 Fig 3.1 • Do any of these bikes meet your criteria? • You need to also find a bike that fits in your price range!!

  4. Efficiency and Effectiveness • You can see the difference between efficiency and effectiveness by comparing different designs of bikes. • A one-speed bike is effective in carrying you from one place to another • A 21- speed bike is just as effective as a one-speed, but it’s more efficient. (by changing gears, you can increase your speed and climb hills more easily) • Usually in evaluating a mechanical device, you are looking for the best combination of effectiveness and efficiency at a cost that you can afford

  5. Function and Design • Scientist, engineers and other inventors want to develop mechanical devices that work efficiently and effectively. To do that they consider both the function and design of the device. • Function- is what the device is supposed to do • Design- is the physical form of the device that makes it usable • Think of the bike again..all bicycles carry a person (function) but they have very specific designs

  6. Considering the Environment • We also have to think about the effect of the device on the environment. • For example..spikes in the tires on mountain bikes help you climb slopes, but they tear up the soil and plants even more than ordinary bike tires...

  7. Almost done this section • You will need to read Pg. 308-312 to help with the next activity • Case Study- Evaluating a Mechanical Device When you are finished you need to get into a group of 3-4 and either evaluate: • the “new” mechanical device on pg. 313 OR • Pg. 314 # 3 • Be ready to discuss this in class (will be handed in also) • Write notes under each criteria

  8. Evaluation for Development • If you are buying a mechanical device, you need to think about how to evaluate it. • A thorough evaluation helps you make a better choice and see how you can improve it. • Think back on the old bike we have seen earlier on...aren’t you glad someone evaluated it and saw ways to improve it

  9. You are the designer • You get to design a “new” piece of equipment. • It can be anything that you think you can improve on • Snowmobile • School bell • Skateboard • Anything else……

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