Machines 14.1 Machines help people do work. 14.2 CHAPTER NEW CHAPTER Machines the BIG idea Machines help people do work by changing the force applied to an object. 14.1 Machines help people do work. 14.2 Six simple machines have many uses. 14.3 Modern technology uses compound machines. CHAPTER OUTLINE CHAPTER RESOURCES

14.1 Machines help people do work. When you use a machine to do work, there is always an exchange, or tradeoff, between the force you use and the distance over which you apply that force. You can use less force over a greater distance or a greater force over a shorter distance to do the same amount of work. machine mechanical advantage efficiency CHAPTER RESOURCES SECTION OUTLINE

14.1 Machines help people do work. When you use a machine to do work, there is always an exchange, or tradeoff, between the force you use and the distance over which you apply that force. You can use less force over a greater distance or a greater force over a shorter distance to do the same amount of work. machine mechanical advantage efficiency SIMULATION Explore the mechanical advantage of an inclined plane. CHAPTER RESOURCES SECTION OUTLINE

Six simple machines have many uses. 14.2 Six simple machines have many uses. Simple machines change the size and/or direction of a force. simple machine lever fulcrum changes size changes direction wheel and axle changes both fulcrum Input force Output pulley inclined plane wedge screw CHAPTER RESOURCES SECTION OUTLINE

Modern technology uses compound machines. 14.3 Modern technology uses compound machines. • Compound machines are combinations of simple machines. compound machine wheel and axle lever wheel and axle nanotechnology robot • Modern technology creates new uses for machines. CHAPTER RESOURCES – Microtechnology and nanotechnology SECTION OUTLINE – Robots

14.1 Machines help people do work. I. Machines help people do work. A. Machines change the way force is applied. mechanical advantage 1. Changing the Size and Distance of a Force 2. Changing the Direction of a Force efficiency 3. Mechanical Advantage of a Machine B. Work transfers energy. 1. Energy 2. Work C. Output work is always less than input work. 1. Efficiency and Energy CHAPTER RESOURCES 2. Increasing Efficiency KEY CONCEPT SUMMARY

Six simple machines have many uses. 14.2 Six simple machines have many uses. II. Six simple machines have many uses. simple machine A. There are six simple machines. lever 1. Lever fulcrum wheel and axle 2. Wheel and Axle pulley 3. Pulley inclined plane 4. Inclined Plane wedge 5. Wedge screw 6. Screw B. The mechanical advantage of a machine can be calculated. CHAPTER RESOURCES KEY CONCEPT SUMMARY

Modern technology uses compound machines. 14.3 Modern technology uses compound machines. III. Modern technology uses compound machines. compound machine A. Compound machines are combinations of simple machines. nanotechnology 1. Gears robot 2. Mechanical Advantage of Compound Machines B. Modern technology creates new uses for machines. 1. Microtechnology and Nanotechnology 2. Robots CHAPTER RESOURCES KEY CONCEPT SUMMARY

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