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
Write at least 5 information about Efficiency p