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Energy Test

QuestionAnswer
What is energy? The ability to do work. It is measured in joules.
What are the different forms of energy? Mechanical Thermal Radiant Chemical Electrical Nuclear Sound
What is mechanical energy? Give a real world example. The energy of motion used to perform work.
What is thermal energy? Give a real world example. This is the total energy of all of the particles of a substance.
What is radiant energy? Give a real world example. The form of energy that travels in electromagnetic waves. This is also known as light energy.
What is chemical energy? Give a real world example. The energy of a compound that changes as its atoms are rearranged (energy stored in bonds between atoms like food, coal and other fuels).
What is electrical energy? Give a real world example. The energy of moving electrons.
What is nuclear energy? Give a real world example. Energy created from the splitting of the nucleus of a radioactive element.
What is sound energy? Give a real world example. This type of energy creates particles of air vibrating.
What is a renewable resource? Give a real world example. A natural resource that can be replaced at the same rate at which the resource is consumed.
List all of the renewable resources. - solar energy (sun) - wind - hydropower (water) - biomass (things that were once living like plants, wood, waste are burned for energy) - geothermal (heat from Earth underground heats up earth's crust)
What is a nonrenewable resource? A resource that forms at a rate that is much slower than the rate at which it is consumed.
List all of the nonrenewable resources. Coal Oil Natural Gas Petroleum Nuclear (Uranium)
What is a fossil fuel? A nonrenewable energy resource formed from the remains of organisms that lived long ago. Examples are coal, oil, natural gas, and petroleum.
What is potential energy? Give a real world example. The energy an object has because of its position.
What is kinetic energy? Give a real world example. The energy of motion.
What is natural gas used for? It is a fossil fuel used to heat some homes, ovens, and stoves.
What is biomass? Organic matter (like plants, wood...) burned for energy.
What is petroleum used for? It is a fossil fuel used to create gasoline, wax, and chapstick (gross).
What is the most popular use for coal? Coal is most commonly used to generate electricity. The fossil fuel is burned to heat water, create steam, and turn a turbine to generate electricity.
What is an energy resource? A natural resource that can be converted into other forms of energy to do work. OR how we obtain energy
What is the source responsible for most other energy resources? The sun.
State the law of conservation of energy. Energy cannot be created or destroyed.
Be able to identify the seven forms of energy in a real world example. For example, list the energy transformation in a no battery flashlight. Chemical (humans breaking chemical bonds from food) to mechanical (hand movement) to mechanical (lever turning gears) to electrical (electrons moving through wires) to radiant (light), thermal (heat from light and friction), and sound (lever clicking)
What is friction? The property that causes objects to resist being moved across each other.
What are the four factors of friction? 1. soft or hard material 2. small or large surface 3. rough or smooth surface 4. high or low pressure
What does friction produce? Heat or thermal energy
What is a closed system? A group of objects that only transfer energy to each other. The energy remains constant (the same) within the system.
What is an open system? A disturbance that transfers energy from place to place.
What is an energy transfer? Energy is going from one form to another.
What is energy efficiency? A comparison of the amount of energy before conversions with the amount of useful energy after the conversion.
If something is said to be energy efficient, what does that mean? There is a relatively small amount of energy being wasted (nothing can ever be 100% efficient).
If something is said to NOT be energy efficient, what does that mean? There is a large amount of energy being wasted.
If you were on a roller coaster, where would you experience the greatest potential energy? Why? The greatest potential energy would be at the highest point because gravity will pull the roller coaster down with a greater force.
What happens to the energy throughout your ride on the roller coaster? Why? The energy becomes less because energy is used to overcome friction.
What is the state of energy? a condition that energy is in at a specific time (potential or kinetic)
What is a form of energy a particular way in which energy appears.
How do we get electrical energy from a battery? it is in chemical form first then turns into electrical
How do you calculate work? work = force (Newtons) x distance (meters)
What is the unit for energy? joules or Newton meter
How do you calculate power? power = work (joules) / time (seconds)
What is the unit for power? watts
What is a wave? a disturbance that transfers energy from place to place
Waves that require a medium through which to travel are called _________________. mechanical waves
Waves that move the medium at right angles to the direction in which the waves are traveling are called ___________. transverse waves
The highest parts of a transverse wave are called __________. a crest
The lowest parts of a transverse wave are called __________. trough
What type of wave moves the particles of the medium parallel to the direction in which the waves are traveling? longitudinal waves
Give an example of a wave that can travel through empty space. light or electromagnetic waves
What are four basic properties of waves? amplitude wavelength frequency speed
What is amplitude? the maximum distance the particles of the medium carrying a wave move away from their rest position
The amplitude of a wave is a direct measure of its _______. energy
What is wavelength? the distance between two corresponding parts of a wave (can measure from crest to crest or trough to trough)
What is frequency? the number of complete waves that pass a given point in a certain amount of time
What happens to the wavelength if you increase the frequency of the wave? it gets smaller
What is the unit used to measure frequency? hertz
Created by: kallayj