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Understanding Work, Energy, and Machines: Chapter 8 Overview

Explore the fundamental concepts of work, energy, and machines in this chapter. Learn about the equations for work, power, and energy, as well as how to calculate them. Dive into topics such as potential and kinetic energy, the Law of Conservation of Energy, and efficiency in machines. Enhance your understanding of these essential physics principles.

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Understanding Work, Energy, and Machines: Chapter 8 Overview

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  1. WORK AND ENERGY CHAPTER 8

  2. 1. What are the 2 things required for work to be done p 103 2. Equation for Work p 104 3. What is the unit of Work ? 4. What is Power? p 105 5. Power Equation p 105 6. What is the unit of Power ?

  3. 7. How much work is done on a 100 N boulder that you carry horizontally across a 10m room ? • 8. How much work is done on a 100 N boulder when you lift it 1 m ?

  4. CW : • 1. How much work is done when 10 N force pushes a cart 3 m ? • 2. Calculate the work done in lifting 300 N rock 2 m above the ground ?

  5. POTENTIAL ENERGY • 7. What is potential energy ?p 106 • 8. What is the PE equation ? P 107 • 9. How much work is extended if you lift a 100N boulder , 1m ? • What power is generated if it was lifted in 1 sec? • What is the gravitational potential energy of the boulder?

  6. CW • What is the potential energy of the 300 N rock lifted 3m above the ground? • Calculate the power expended when the rock was lifted 3m in 2 sec.

  7. KINETIC ENERGY • 10. What is kinetic energy ? P 108 • 11. What is KE equation ? • 12. What is the relation of Work and Energy ? • 13. What is the Law of Conservation of Energy p 110

  8. CW • Calculate the change in Potential energy of 10 kg sand dropped from 10m height • Calculate the KE of a 2 kg toy truck that moves 2m/s

  9. Machines and Efficiency Define Machine and identify the types of machines with description p 111-114 Write at least 5 information about Efficiency p 114-116

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