WORK AND ENERGY CHAPTER 8.

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Presentation transcript:

WORK AND ENERGY CHAPTER 8

Am I doing Work ? Give examples of work 3. Read P 103 Define Work Requirements to do work : a. Force is applied b. Object should move a certain distance c. Force and distance should be parallel to each other.

Unit of work Different scenarios of work a. Force parallel to distance b. Force applied on wall with no movement c. Force component moved the box d. Braking force e. Free fall f. Work done by gravity g. carrying a book , moving around the room 6. Read and get some information p 104 .

p107 #s 1 part a 10 points P107 # 2 part a 10 points P120 # 21, 22 part a, 24 a 10 points

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 6. What is Power? p 105 7. Power Equation p 105 8. What is the unit of Power ? 9. Please do #23 / p 120 hint : related #22 10. What is a Mechanical Energy ?p106 11. What is potential energy ?p 106 12. What is the PE equation ? P 107 Please do #22 p 120 Please do #24 a and b p 120 Please do # 25 p 120

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 ? p108 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

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