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
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)
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
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
Electrical EnergyThe movement of electrons through matter.Electricity is a form of electrical energy.
Electromagnetic EnergyVisible light is a form of electromagnetic energy.Each color of light (Roy G Biv) represents a different amount of electromagnetic energy.
Thermal (heat) Energy
The vibration of particles of matter.More vibrations = more heat energy (hotter)Fewer vibrations = less heat energy (cooler)
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).