WORK AND ENERGY CHAPTER 8.

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Presentation transcript:

WORK AND ENERGY CHAPTER 8

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 ?

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 ?

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 ?

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?

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.

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

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

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