For 9th grade Physics, chapter 6 "Energy transformations and energy transfers"
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The document discusses potential and kinetic energy. It defines energy as the ability to make things move and lists four of the seven main types of energy - chemical, light, heat, and nuclear - providing examples of each. Kinetic energy is defined as the energy of motion, while potential energy is stored energy not yet used. An example is given of a roller coaster having kinetic energy when moving but potential energy when stopped at the top of a hill, as it has stored energy to move down due to its position. Potential energy can be transformed into kinetic energy and vice versa.
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This document discusses heat transfer and the three main methods: conduction, convection, and radiation. Conduction involves the direct contact transfer of heat between objects. Convection refers to the transfer of heat by the movement of molecules within a substance from warmer to cooler areas. Radiation involves the transfer of heat through space, such as the sun's rays causing sunburn. The document provides examples and descriptions of each type of heat transfer.
Capter 10
The document discusses various topics relating to thermal energy and heat. It begins by explaining that thermal energy is a measure of the average kinetic energy of molecules. It then discusses how temperature changes throughout the day due to the sun warming and cooling the Earth. It also explains how adding or removing heat can change the temperature of objects like a snowman and boiling water. The document then defines key terms like temperature, heat, specific heat capacity, latent heat, and thermal expansion. It provides examples and equations for calculating heat transfer and temperature change. In summary, the document provides an overview of thermal energy concepts and how heat transfer impacts temperature.
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Is the universe infinite or does it simply expand !
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Is the universe infinite or does it simply [autosaved]
Is the universe infinite or does it simply [autosaved]
For 9th grade Physics, chapter 6 "Energy transformations and energy transfers"
- 1. Energy What are potential and kinetic energy?
- 2. First some review… Write down the definition of energy. Write down the four of the seven types of energy and an example of each.
- 3. Energy… …is the ability to make things move
- 4. The seven types of energy… Chemical - gasoline, Light – flash light, Heat – burner on a stove, Nuclear - sun, Mechanical - car, Sound – music on the radio, Electrical - lightning
- 5. Definitions Kinetic Energy: the energy of motion Potential Energy: stored energy
- 6. A Roller Coaster A roller coaster speeds along its track. It has kinetic energy because it is moving.
- 8. A Roller Coaster As it slows to a stop at the top of a hill, it has potential energy because of where it is. It has the potential to move because it is above the ground and has somewhere to go.
- 10. What type of energy is this? (Remember the seven types?)
- 12. Right, mechanical. What if the cars crashed and burned? What type would it be?
- 14. Right, heat.
- 16. Substances like wood, coal, oil, and gasoline have stored energy because of their chemistry – they can burn Stored energy is potential energy
- 17. Potential Energy can be changed into Kinetic Energy Also Kinetic Energy can be changed into Potential Energy