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Energy! The ability to do work.

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Presentation on theme: "Energy! The ability to do work."— Presentation transcript:

1 Energy! The ability to do work

2 Types of energy Nuclear Mechanical Electromagnetic (Solar/Light)
Potential Kinetic Electromagnetic (Solar/Light) Electrical Chemical Thermal (Heat)

3 Nuclear Nuclear energy is created from reactions in the nucleus of the atom:

4 Nuclear Fusion – Atoms combining into one atom
Fission – An atom splitting apart Radioactivity - an atom decaying (losing part of its nucleus)

5 Energy relating to the motion or position of an object
Mechanical Energy Energy relating to the motion or position of an object Mechanical Energy has two forms: Kinetic & Potential

6 Potential and Kinetic Potential: stored energy
It has the potential to do work, but it is not in the action of doing any work. Kinetic: energy of motion Energy that is actively doing work.

7 Examples of Mechanical Energy:
Wind – Molecules of air moving and colliding with objects. Sound – molecules of air hitting your ear drum causing it to vibrate. Hydroelectric – Water pressure causing a turbine to spin Friction – rubbing objects together creating heat.

8 Electromagnetic (Light)
Waves of energy that travel through space from the sun and stars Different wavelengths carry different amounts of energy We only see a small portion of the spectrum

9 Electrical Movement or flow of electrons Electrons carry a charge

10 Energy stored in the form of chemical bonds

11 Chemical Fe2O3 + 2Al → 2Fe + Al2O3 Reactants  Products

12 Special type of chemical reaction: Combustion!
Hydrocarbon + oxygen  carbon dioxide + water Burning natural gas: CH4 + O2  CO2 + H2O Burning propane: C3H8 + O2  CO2 + H20 Burning gasoline: C8H18 + O2  CO2 + H20

13 Endothermic and Exothermic Reactions
Breaking bonds between atoms uses energy– this is an Endothermic process Making bonds between atoms releases energy– this is an Exothermic process. In a chemical reaction, bonds are both made and broken. Sometimes the net result will be endothermic, and sometimes it will be exothermic.

14 Most Chemical reactions need something to get started – Activation Energy

15 Heat (thermal) Movements of atoms in a substance

16 Heat (thermal) Heat vs. Temperature
Temperature is the average speed of the molecules. The faster the molecules move, the higher their temperature. Heat is the energy that flows due to temperature differences. The Amount of the substance will affect heat but not temperature.

17 Heat (thermal) 90 degrees Celcius 40 degrees Celcius
Which has a higher temperature? Which has more heat? (Hint – which will warm you up more?)

18 Heat transfer Conduction Convection Radiation
Heat transferred through direct contact between substances Convection Heat transferred by currents moving in a gas or liquid Radiation Heat transferred by electromagnetic waves


20 Energy Transfer Energy is constantly converting from one form to another

21 Energy Transfer Law of Conservation of Energy: Energy is neither created nor destroyed – it is converted. Nothing is 100% efficient

22 Here electrical energy is being converted to:
____________ But what other conversions are happening?

23 Here electrical energy is being converted to:
________________ But what other conversions are happening?

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