1. Energy

2. What is Energy? Energy is the capacity to do work or to produce change
1 joule = energy needed to lift a 1N (newton) object to a height of 1 m (metre).

3. Forms of Energy Many different forms of energy:
Solar energy: light and heat
Elastic energy: wire spring
Electrical energy: power station
See p. 35, chart 2.6

4. Four basic forms:
1. Thermal energy: energy that comes from the random motion of the particles that make up a substance. Ex. 100 mL of hot water more energy that 100 mL of room temperature water

6. 2. Radiant energy
Kind of energy that contained in and transported by electromagnetic waves Ex. X-rays, microwaves, Ultraviolet waves of sun

8. 3. Chemical energy Energy stored in the bonds of a molecule
Ex. Combustion of gasoline in a car
combustion of fuel in a gas camping lamp
Photosynthesis of sunlight into glucose in plants
cellular respiration uses glucose for energy to move

10. Mechanical Energy
Energy that results from the speed of an object, its mass, and its relationship to its surroundings.
Ex. Rock falling off a cliff.
Wind turbines
water falls for hydroelectric power

12. Energy Transformation and Transfers
changing of energy from one form to another
Ex. Burning a log: chemical to radiant & thermal

14. 2. Transfer Movement of energy from one place to another.
ex. Energy travels from log to surroundings

15. Describe an energy transformation and/or an energy transfer for each:

16. Heat Transfer of thermal energy from one place to another.
Heat always travels from the hotter place toward the colder place.

18. Work
Workbook p.23-26
Read text p.34-42, do 4-8, p