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8th Energy and Heat
Energy and Heat
| Question | Answer |
|---|---|
| What is energy? | The ability to do work |
| What is potential energy? | Stored energy or energy "waiting to happen" |
| What is gravitational potential energy? | Energy stored due to gravity |
| What is chemical energy? | Energy stored in food or fuel |
| Give some examples of gravitational potential energy. | Skier at the top of a mountain, highest point of a swing, books on a shelf |
| Give some examples of chemical potential energy. | food, gasoline, natural gas, batteries, logs of wood |
| What is kinetic energy? | Energy of motion |
| Describe the energy conversion that takes place in a blow dryer. | Electrical to heat, light, and sound |
| How does a person on a swing show energy conversion? | Highest points of the swing show max potential energy. Lowest points show max kinetic energy. |
| What is temperature? | Temperature is a measure of how fast molecules are moving. Fast moving = hot.........show moving = cold |
| How is temperature different from heat? | Temperature measures how fast particles are moving. Heat also measures how fast particles are moving but includes the NUMBER of particles also. |
| Which has more heat.....a small fire or a giant glacier? | A giant glacier has a lower temp but actually has more HEAT because of its massive size (Many more particles) |
| Name the 3 forms of heat transfer. | Conduction, convection, and radiation. |
| Define conduction and give an example. | Conduction is heat transfer through objects that are touching. Examples include a snake warming on a hot rock, touching a hot iron, straightening your hair with a flat iron |
| Define convection and give an example. | Convection is heat transfer through differences in density. (Happens in fluids) Example: Hot air rising in the summer to cause a thunderstorm |
| Define radiation and give an example. | Radiation is heat transfer in the form of waves. Examples include heat coming from a fire, heat traveling to earth from the sun |
| Radiation must be ________________ before it can heat something. | ABSORBED |
| Which is a better absorber of radiation: light objects or dark objects? | DARK |
| Which is a better absorber of radiation: smooth objects or rough objects? | ROUGH |
| Which of the three forms of heat transfer does not need a medium to travel? | RADIATION |
| Conduction works best in | SOLIDS |
| Heat energy travels to the earth by | Radiation |
| Convection occurs in | Liquids and Gases (FLUIDS) |
| What is the boiling point of water ? | 100 degrees celsius |
| What is the freezing point of water? | 0 degrees celsius |
| Explain how a small child playing on a swing is an example of PE being converted to KE. | At the top of the swing on both sides the PE is at its greatest. The KE is greatest at the bottom of the swing. |
| How is it possible for a glacier to have more HEAT than a small fire even thought the fire has a higher temperature? | The glaciers has significantly MORE MASS. Heat is based on the number of particles. |
| Describe a situation where an apple is an example of GPE. | While its sitting in the tree! |
| Describe a situation where an apple is an example of CPE. | When you EAT it. |
Created by:
cwalczak
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