Forms of Energy and

Energy Conservation

What type of energy do we see on a roller coaster?

Potential and Kinetic

Does the energy stay in one form?

Where does my energy to play sports come from?

Energy doesn’t just “appear” it comes from something or some other form

Energy conversionEnergy cannot be madeEnergy cannot be destroyed or “used up”Energy can just change from one form to another.

Kinetic -> Potential -> Kinetic

Law of Conservation of Energy

Energy cannot be created or destroyed, only changed in form.

https://www.youtube.com/watch?v=8GLtFNaiMH8

Are they using up energy?No- just converting it from one form to another

So, where does my energy to play sports come from?

I get my kinetic energy from potential energy I have stored- from the food that I ate.

What can I convert electrical energy into?

Heat energy (in a toaster)Sound energy (in a radio)Light energy (in a bulb)Mechanical energy (on a ride)

Electrical energy goes into the hairdryer, what kind of energy is it changed into?

Seven forms of energy

Energy is the ability to make things do workEnergy has no mass and no volumeEnergy can be found in 7 different forms

Mechanical Energy

Energy due to the position or motion of an object

Sound Energy

Energy of vibrating air molecules

https://www.youtube.com/watch?v=Ude8pPjawKIhttps://www.youtube.com/watch?v=ynqzeIYA7Iw

Chemical EnergyThe energy used to hold atoms in a molecule together, such as in food or fuel.Chemical bonds are broken during a chemical reaction (burning, rusting, digestion)

Chemical energy from food

What organelle in our cells helps break the chemical bonds of food molecules so we can have energy?Mitochondria

Which tissues in our body need the most mitochondria? Muscles or Fat tissue?

Muscles tissue

Electrical EnergyThe movement of electrons through matter.Electricity is a form of electrical energy.

Light Energy

Energy carried by light, x-rays, microwaves

Electromagnetic EnergyVisible light is a form of electromagnetic energy.Each color of light (Roy G Biv) represents a different amount of electromagnetic energy.

Electromagnetic Spectrum

Increasing Energy

Thermal (heat) Energy

The vibration of particles of matter.More vibrations = more heat energy (hotter)Fewer vibrations = less heat energy (cooler)

Nuclear EnergyThe energy that holds protons and neutrons together in the nucleus of an atom

Nuclear EnergyThe nucleus of an atom is the source of nuclear energy. When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy.

Nuclear energy is also released when nuclei collide at high speeds and join (fusion).

Nuclear Power PlantNuclear E -> thermal E -> mechanical E-> electrical E

Nuclear Energy

The sun’s energy is produced from a nuclear fusion reaction in which hydrogen nuclei fuse to form helium nuclei.