TOPIC: Energy AIM: Describe the various sources of energy that exist on Earth. Do Now: 1. Take out...

TOPIC: EnergyAIM: Describe the various sources of

energy that exist on Earth. Do Now: 1. Take out your KE and PE notes.2. Take out your numbers.

HW: Page 2 in KE/PE notes packet #’s 1 – 10 on the bottom off paper.

Gravitational

PE

•PE that depends on height

•More height greater GPE

•Less height less GPE

Energy appears in many forms. Which form of energy is lightening?

1.Magnetic

2.Mechanical

3.sound

4.Electrical

A family is moving from Pennsylvania to Connecticut. As the moving van burns gasoline, it converts

1.chemical energy into mechanical energy

2.kinetic energy into potential energy

3.thermal energy into electrical energy

4.mechanical energy into kinetic energy

When an electric current flows through a metal filament of a light bulb, the electrical energy is converted into

1.heat energy, only

2.heat and light energy

3.light and motion energy

4.light energy only

Which energy source was developed through the invention of the atomic bomb?

1.Nuclear

2.Geothermal

3.Solar

4.Hydropower

An unlit match contains

1.Thermal energy

2.Electrical energy

3.Chemical energy

4.Nuclear energy

Which device produces mechanical energy?

1.A battery

2.A light bulb

3.An electric motor

4.A solar cooker

A high diver steps off a diving platform that is 10m above the water. If no air resistance is present, during the fall there will be a decrease in the diver’s

1.potential energy

2.total mechanical energy

3.kinetic energy

4.momentum

Which of the following is an example of kinetic energy?

1.A car not moving

2.Water falling off a dam

3.A rock resting on a ledge

4.A person sitting in a chair

Which of the following increases when a metal spring is stretched horizontally?

1.Potential energy

2.Kinetic energy

3.Electrical energy

4.Chemical energy

What happens to the kinetic energy and potential energy of a ball during free fall?

1.PE and KE both increase.

2.PE and KE both decrease.

3.PE decreases and KE increases.

4.PE increases and KE decreases.

1. Describe the difference between renewable and nonrenewable resources.

• Nonrenewable: – Once it is used up, it

cannot be made again– Not as clean

• Renewable: – Constantly available– Cleaner form of energy

2. Describe how fossil fuels were produced.

• Formed more than 400 million years ago during the Carboniferous Period (before dinosaurs)

• Made up of plant and animal matter

3. Identify the 3 types of fossil fuels.

•Oil: –Thick, black gooey liquid–Called PETROULEUM(highly flammable)

•Used to produce: –Lubricants (grease, motor oil)

- Plastics- Synthetic fibers- Asphalt

•Natural Gas: –Made out of methane–Burned to provide energy for cooking, heating…

•Burns more cleanly than other fossil fuels

•Coal–Different forms from hard, black rocks to soft, brown dirt

•Creates more than half of electricity in the US

•Creates more pollution

DISADVANTAGE of Burning Fossil Fuels?????

– Release carbon dioxide (global warming)

–Pollution (acid rain, smog)

•Solar energy: uses energy from the sun

http://www.youtube.com/watch?v=x4CTceusK9I

• Disadvantage: – very expensive

Wind: - moves turbines to produce electricity

http://www.youtube.com/watch?v=tsZITSeQFR0

•Advantages:–No pollution–Low costs

•Disadvantage–No wind no energy

Geothermal energy: •Heat from earth’s interior (magma) used to generate electricityhttp://www.youtube.com/watch?v=-ajqiPe_9Ko

Disadvantages:

•Could run out of water if too much is removed too quickly

•Difficult to tell where geothermal reservoirs are

•Water could contain minerals that are corrosive

Hydropower: •electricity produced from energy of

moving waterhttp://www.youtube.com/watch?v=fvYaCtjpMvk

Biomass: •Energy from byproducts of human activity•Example: wood, garbage, crops

http://www.youtube.com/watch?v=sN68ef6trEs

Disadvantages: •Pollution •Building power plants disrupts ecosystems•Expensive

Biogas is one of the most popular sources of renewable energy. It is a good resource to make farms be independent as biogas can be used for electricity generation. Compressed biogas can also be used as an alternative vehicle fuel. It is a colorless, odorless, inflammable gas. Biogas is produced when organic matter is broken down by anaerobic bacteria.  Bio energy is a major player in sustainable living in countries like India and China where individual biogas generators have been developed in villages  to make them self-sufficient in terms of power generation.

Ethanol = clear, colorless alcohol fuel made from the sugars found in grains, such as corn & wheat, and potato skins & rice. It is renewable because it is made from plants. To make ethanol we use yeast to ferment the sugars and starch in corn. Corn is the main ingredient for ethanol in the US due to its abundance and low price. The starch is fermented into sugar fermented into alcohol. Other crops such as, barley, wheat, rice, sorghum, sunflower, potatoes, sugar cane and sugar beets can also be used to produce ethanol.

•Nuclear Energy: –found in the nuclei of atoms

Let’s summarize…

1.Describe the difference between renewable and nonrenewable resources.

2.Identify three nonrenewable resources.

3.Describe the disadvantages of using fossil fuels.

4.Identify some renewable resources.