What is energy? Ability to do work (change)
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- Maximilian Gardner
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1
2 What is energy? Ability to do work (change)
3 Remember the forms of energy! 1. Thermal Energy motion of energy in the particles of matter due to more/less heat. (Heat energy = when thermal energy is transferred) 1. Radiant Energy electromagnetic waves of light (Solar Energy = specifically from the Sun) 2. Chemical Energy energy stored in matter 3. Electrical Energy energy flowing in an electric circuit. 4. Mechanical Energy due to motion and position 1. Potential Energy stored energy 2. Kinetic Energy moving energy
4 Types: - Chemical Types: - Thermal - Heat - Solar - Electrical - Radiant
5 Potential Energy - Is stored energy = not in use - Can t see it, but it is there. - Based on position/height or composition (inside materials) It is called potential energy because it has the potential to be converted into other forms of energy, such as kinetic energy.
6 Potential Energy Examples: 1. Wound-Up Spring 2.Baseball Pitcher (not released yet) 3. Holding a hammer high.
7 What letter will the cart have the most PE? The higher the object = the more the High PE potential energy Low PE
8 The more mass an object has= the more the potential energy vs. vs. vs.
9 More Examples of (Position) Potential Energy: 4. Stretching a rubber band.. -Stores energy Water at the top of a waterfall.. -Stores energy Yo Yo held in your hand.. -Stores energy because of position Drawing a Bow -Stores energy because of position
10 Chemical Energy is a type of Energy is stored in bonds of chemicals that make up the substance. Energy can be released, but hasn t been yet. Potential Energy
11 Chemical Examples: FUELS: Wood Coal Oil Gas *Energy is stored until they are burned.
12 Chemical Examples: Food Batteries Candle wick
13 Kinetic Energy - Is based on movement. - Can see it.
14 Examples of Kinetic Energy Running Wood Burning Rock Falling
15 More Examples of Kinetic Shooting a rubber band. Water falling over the fall. A Yo-Yo in motion. Energy Releasing the arrow from the bow.
16 Types of Kinetic Energy Thermal/Heat particles in matter move as heat is added. Radiant/Solar electromagnetic waves move through space to Earth Electrical electrons move through metal in a closed circuit to provide power to objects.
17 Energy doesn t always stay in one form it TRANSFORMS Occurs between various types of energy. Energy is never lost. 1 energy form can transform into 2 different forms.
18 Law of Conservation of Energy Energy can neither be created nor destroyed, it just changes forms. This means that no energy is ever lost! Energy is just transformed. Total amount of energy in = total energy out
19
20 Potential Energy Converted to Kinetic Energy When stored energy begins to move, the object now transfers from potential energy into kinetic energy.
21 Energy Transformation with Food Potential Energy: When you look at your food and eat it because it has the potential to give you energy Kinetic Energy: When you digest your food into usable energy the chemicals in the food are set into motion
22 Examples of transformations of Potential to Kinetic Water behind a dam > water falling down.
23 Examples of transformations of Potential to Kinetic Book on high shelf> book falling down.
24 Examples of transformations of Kinetic to Potential Water moving down a river > water stopping at a closed dam.
25 Examples of transformations of Kinetic to Potential Moving book up to a shelf > book sitting on a high shelf.
26 Name the transformations
27 Don t forget about friction Friction generates heat This means Not all potential energy is converted to kinetic.some is also transformed to thermal energy. This makes objects stop and transform back to potential.
28 Energy Lesson Review Energy is the ability to do work. All forms of energy fall under 2 categories: Kinetic or Potential Potential = stored Kinetic = moving Energy cannot be created or destroyed. Energy is always being transformed.
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