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Mechanisms CPU Objectives Activity 1 1-1. Recognize that all machines are made up of combinations of simple machines. 1-2. Identify the components of a lever. 1-3. Determine that the amount of required force varies in relation to the distance from where that force is applied in relation to the lever’s fulcrum. 1-4. Identify the three classes of levers. 1-5. Verify how the three classes of levers work by experimenting with the Applied Technologies Mechanisms Trainer. 1-6. Read about the career responsibilities and requirements of small engine mechanics. Activity 2 2-1. Identify the characteristics of a wheel and axle. 2-2. Define how a fixed pulley differs from a movable pulley. 2-3. Experiment with the differences in force required when using fixed and movable pulleys. 2-4. Compare lengths of inclined planes to determine which one requires the least force. 2-5. Determine that a screw is nothing more than an inclined plane wrapped around a post. Activity 3 3-1. Define terms associated with gears and gear trains. 3-2. Identify the four classifications of gear trains. 3-3. Determine how spur gears work together in a simple gear train via experimentation. 3-4. Experiment with a compound gear train to determine its attributes. 3-5. Discover the characteristics of chain and sprocket drives via experimentation. Activity 4 4-1. Recognize the two properties of matter upon which force is affected. 4-2. Determine why SI was developed 4-3. Identify the seven base units of the SI. 4-4. Identify the only base unit still defined by a physical object and describe its properties. 4-5. Calculate force for general motion, falling objects (gravity), and spring scales. Activity 5 5-1. Define work as it relates to mechanisms. 5-2. Identify what a block and tackle system is and recognize how it helps lift loads and reduce work. 5-3. Calculate work using five different formulas. Activity 6 6-1. Define power and efficiency. 6-2. Calculate power and efficiency using different formulas. 6-3. Define mechanical advantage. Activity 7 7-1. Compute IMA, AMA, and efficiency for simple machines. 7-2. Read about the career responsibilities and requirements of aircraft mechanics. Activity 8 8-1. Define aspects of friction and how it affects mechanisms both positively and negatively. 8-2. Consider the effects friction has while performing an experiment using components of the Applied Technologies Mechanisms Trainer. 8-3. Calculate friction using mathematical formulas. Activity 9 9-1. Define drive train speed ratio. 9-2. Determine the drive train speed ratio of a gear train constructed on the Applied Technologies Mechanisms Trainer. 9-3. Calculate the drive train speed ration for both simple and compound gear trains using the number of teeth the diameter of the gears. 9-4. Calculate IMA for simple and compound gear trains. Activity 10 10-1. Discover how search engines work. 10-2. Find out ways to optimize a page for better search engine ranking. 10-3. Understand how to add Meta tags for keywords using both HTML and Expression Web. 10-4. Add a contact footer to the DWT. 10-5. Explain some ways to make your website search engine friendly, based on your experience with search engines. In Activity 15, students will take the Vocabulary Test and the Post-test. Activity 10 through Activity 15 require students to complete challenges to meet numerous high level problem-solving objectives. The objectives for the challenges in this CPU include: Challenge 1 You will conduct research on a career of your choice in the mechanisms/engineering field. Share your findings in a presentation. Challenge 2 You will develop and work through an experiment on inclined planes. Challenge 3 On paper, you will construct a winch which will be able to lift objects weighing no more than 908 kg (one ton). The number and sizes of gears will have to be such that you can crank the winch handle with your hand and lift the load. Challenge 4 You will design on paper and build a working model of a machine. Challenge 5 You will take an existing product and develop a kinematic diagram identifying the input motion and force as well as the output motion and force. |
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