What is energy the ability to do

What is energy? • “the ability to do work or cause change” • The combination of energy and matter make up the universe: • Matter is substance, and energy is the mover of that substance.

What is the source of our energy? • The source of practically all our energy is the Sun.

How long can our energy supplies last ? ? ? • Renewable resources: have to be replenished continually. • Example- hydroelectric power from dams. Great source…as long as it rains enough to keep the rivers and lakes full. What might happen during a drought?

Non-Renewable Resources • Both fossil fuels & nuclear energy are nonrenewable resources. • Fossil fuels take millions of years to produce and we are using them up at an alarming rate. This results in short supplies, high demands and higher prices. • Nuclear fuel comes from Uranium, an element found in the Earth’s crust, and produces a radioactive waste product.

Non- Renewable Energy Resources (Pros & Cons) • Pros- Fossil Fuels: • Coal, oil, natural gas • Current industry and transportation standards are set up to run on these types of energy sources. • Employs millions of people worldwide. • Relatively inexpensive energy source. • Cons- Fossil Fuels: • Non-renewable resource. • Pollutants released cause acid rain, global warming and respiratory illnesses. • Cost to change over to other sources of energy would hurt world economy.

Alternative Energy Sources (Inexhaustible) • Solar Energy- use photovoltaic cells to convert light energy into electrical energy. • Geothermal Energy- Use the heat deep within the earth to heat our homes and to produce steam to run power plants. • Tidal Energy- Use contained tide water to turn turbines in power plants near oceans. • Wind Energy - use the power of the wind to turn wind turbines to generate electricity.

The Law of Conservation of Energy • Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes.

How is all energy divided? 2 Types: All Energy Potential Energy Gravitational Elastic & Chemical Potential Energy Kinetic Energy Translational Rotational & Vibrational Kinetic Energy

Potential Kinetic • energy of position or energy in storage. • Water behind a dam • Hammer over head • Food on the plate • energy of motion, the form capable of doing work • Flowing water • A falling hammer • Electrons flowing through a wire

The Law of Conservation of Energy • Energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes.

Energy is nature’s way of keeping score. We sense energy only when the score changes, either a transformation from one form of energy to another, or a transfer of energy from one point to another.

7 fundamental forms of energy 1. 2. 3. 4. 5. 6. 7. Mechanical Energy Radiant Energy (Light/Electromagnetic) Sound Energy Chemical Energy Heat/Thermal Energy Electrical Energy Nuclear Energy

The 7 Forms of Energy Preview • https: //youtu. be/MZWICe. Fs. Ny 0 • Pay close attention to each of the following forms of energy discussed in the video!

What is Mechanical Energy? o. Total P. E and K. E in a system The bowling ball has mechanical energy. When the ball strikes the pins, mechanical energy is transferred to the pins!

Examples of Mechanical Energy

What is Electromagnetic Energy? (Radiant) o Light energy o Includes energy from gamma rays, x-rays, ultraviolet rays, visible light, infrared rays, microwave and radio bands

The Electromagnetic Spectrum and YOU!!! • http: //missionscience. nasa. gov/ems. Video_01 intro. html As you watch this video clip on the electromagnetic spectrum, make a list of things in our everyday lives that produce electromagnetic radiation. You will be asked to share your list after the video.

Electromagnetic Spectrum

What is Sound Energy? • Sound energy is a form of energy that is associated with vibrations of matter. It is a type of mechanical wave which means it requires an object to travel through. This object includes air and water. Sound originates from the vibrations that result after an object applies a force to another object.

Sound Energy Sources include: • Voices • Musical Instruments • Noises • https: //academo. org/demos/spectrumanalyzer/

What is Chemical Energy? o Energy that is available for release from chemical reactions. The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.

What is Chemical Potential Energy? o Potential energy stored within the chemical bonds of an object

Examples of Chemical Energy

What is Thermal Energy? o Total potenial and kinetic of atoms and molecules in matter. A hot object is one whose atoms and molecules are excited and show rapid movement. A cooler object's molecules and atoms will show less movement. The more of a substance you have, the more Thermal Energy it will have.

What is Electrical Energy? o Energy caused by the movement of electrons o Easily transported through power lines and converted into other forms of energy

Nuclear Energy • Nuclear power is the use of nuclear reactions that release nuclear energy to generate heat, which most frequently is then used in steam turbines to produce electricity in a nuclear power plant. The term nuclear energy includes nuclear fission, nuclear decay and nuclear fusion.

QUIZ TIME! What type of energy cooks food in a microwave oven? ELECTROMAGNETIC ENERGY What type of energy is the spinning plate inside of a microwave oven? MECHANICAL ENERGY

QUIZ TIME! Electrical energy is transported to your house through power lines. When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy? MECHANICAL ENERGY

QUIZ TIME! What energy transformation occurs when an electric lamp is turned on? ELECTRICAL ENERGY ELECTROMAGNETIC ENERGY

What types of energy are shown below? Mechanical and Thermal Energy (Don’t forget friction)

What type of energy is shown below? Chemical Energy

What types of energy are shown below? Electrical, Mechanical and Electromagnetic Energy

What type of energy is shown below? Chemical Energy (yummy)

What type of energy is shown below? Thermal Energy

What types of energy are shown below? Mechanical, Electromagnetic, Electrical, Chemical and Thermal Energy