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Energy Ch 4,5,9
Mrs. Brandt's 8th grade Science
| Question | Answer |
|---|---|
| - What is work? | Work is accomplished when a force moves an object a distance. |
| -What form of energy moves objects like buses? | mechanical energy |
| -What form of energy is related to the movement of particles that make up matter? | heat energy |
| -What is chemical energy? | It is a form of energy that is stored in food and fuels. |
| -What form of energy is because of the movement of electrons? | Electrical energy |
| -What type of energy does the sun produce? | radiant energy |
| -What form of energy is from the nucleus or center of the atom? | nuclear energy |
| -What form of energy comes from a speaker at a concert? | sound energy |
| -What is energy? | the ability to do work |
| -What is the energy of motion? | kinetic energy |
| -What is the SI unit for work and energy? | Joule |
| -Give an example of work. | Picking up a book that has been dropped OR walking to class |
| -What kind of energy does a slingshot being held back and ready to fire have? | elastic potential energy |
| -Give an example of chemical potential energy. | Fuel used in a cruise liner |
| -What is geothermal energy? | an energy resource that uses the heat of the Earth |
| -What is a nonrenewable resource? | a resource that cannot be replaced |
| -Give 3 examples of a nonrenewable resource. | coal, oil, natural gas, propane, uranium |
| -What is a renewable resource? | a resource that can be replaced |
| -Give 3 examples of a renewable resource. | solar, geothermal, hydropower, biomass, wind |
| -What are fossil fuels? | come from dead plants and animals that were buried 300 million years ago |
| -Name 3 problems that occur with the burning of fossil fuels. | pollution, acid rain, global warming, they will run out |
| -Give 3 examples of ways that an individual can conserve energy. | turning off lights as you exit room, taking awhower instead of a bath, recycling, riding a bike, walking |
| -Why is it important to conserve energy? | fossils fuels are nonrenewable, current technology is not advanced enough to effectively use all renewable sources that are available |
| -What is the Law of Conservation of Energy? | energy may change from one form to another but the total amount of energy never changes |
| -Explain, using the Law of Conservation of Energy, what happens when you plug a blow dryer into the wall. | plugged into the wall uses electricity which causes the device to turn it into heat energy. Energy form has changed but not the amount. |
| Energy that is stored; the energy of position | Potential Energy |
| When a pendulum is released to swing, it has this kind of energy | Kinetic Energy |
| An object held up above the surface of the ground has this. | Gravitational Potential Energy |
| The higher an object is above the ground. | The more gravitational potential energy the object has. |
| Petroleum, natural gas, and coal are all this: | Fossil Fuels (Nonrenewable Resources) |
| A fuel made from renewable organic material from plants or animals | Biomass Fuels |
| Electricity produced by combining Hydrogen and Oxygen gases with water as a byproduct | Hydrogen Fuel Cells |
| Electricity produced when falling or running water turns a generator. | Hydropower or Hydroelectricity |
| What is a disadvantage or using this form of power? | Hydroelectricity can disturb natural ecosystems, because dams are often built to control it. |
| Electricity produced when wind turns a propeller which then turns a generator. | Wind power |
| What are the advantages of using wind power? | Wind power is clean, inexpensive and available everywhere. |
| What are the disadvantages of using wind power? | The wind must be blowing. Large wind farms produce noise, and may have ecological effects. |
| Electricity generated by sunlight hitting a photovoltaic cell | Solar power |
| What is the fuel most often used for this form of energy? | Uranium |
| The formula for kinetic energy | KE (J) = 1/2 m (kg) x v2 (m2/s2) |
| The formula for gravitational potential energy | GPE (J) = m(kg) x 9.8 m/s2 x h (m) |
| The formula for Work | Work = Force * distance |
| According to the law of conservation of energy, what is true about the total amount of energy in the universe? | The total amount of energy in the universe remains CONSTANT. |
| Sulphuric acid mixes with water vapor to make this. | Acid ran |
| What gas produced by burning fossil fuels is thought to lead to global warming? | Carbon dioxide |
| What is the biggest problem with our continued use of fossil fuels? | Fossil fuels are a nonrenewable resource. |
Created by:
mtoutant
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