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Work Energy & Power
Junior Cert
| Question | Answer |
|---|---|
| Force exerted on an object that causes it to move | Work |
| The ability to do work | Energy |
| The rate at which work is done | Power |
| Energy that an object has due to its motion | Kinetic energy |
| Stored energy that results from the position or shape of an object | Potential energy |
| The energy of stretched or compressed objects | Elastic potential energy |
| Potential energy that depends on the height of an object | Gravitational potential energy |
| Kinetic or potential energy associated with the motion or position of an object | Mechanical energy |
| The energy of moving electrical charges | Electrical energy |
| A form of potential energy that is stored in chemical bonds between atoms | Chemical energy |
| The potential energy stored in the nucleus of an atom | Nuclear energy |
| A form of energy that travels through space as waves | Electromagnetic energy |
| A measure of the average energy of motion of the particles of a substance | Temperature |
| Thermal energy that is transferred from matter at a higher temperature to matter at a lower temperature | Heat |
| Process of increasing volume | Expansion |
| Process of decreasing volume | Contraction |
| The change from solid to the liquid state of matter | Melting |
| The change from the liquid to the solid state of matter | Freezing |
| The transfer of energy by electromagnetic waves | Radiation |
| The change from the gaseous to the liquid state of matter | Condensation |
| The process that occurs when vaporization takes place only on the surface of a liquid | Evaporation |
| The transfer of heat from one particle of matter to another | Conduction |
| The transfer of heat by the movement of currents within a fluid | Convection |
| The change of state from a liquid to a gas | Vaporisation |
| How are energy, work, and power related? | If the transfer of energy is work, then the power is the rate at which energy is transferred. |
| How is work calculated? | Force x Distance |
| How is power calculated? | Energy (J) / time (sec) = watts |
| What are the two basic kinds of energy? | potential and kinetic |
| What are some forms of energy associated with the particles that make up objects? | sound, mechanical, thermal, electrical, chemical, nuclear, and electromagnetic |
| What is an energy transformation? | a change of one form of energy into another |
| What does the Law of the Conservation of Energy state? | energy cannot be created or destroyed but can be changed from one form to another |
| How is thermal energy related to temperature and heat? | Heat is thermal energy moving from a warmer object to a cooler object and temperature is the measure of the kinetic energy measured in the objects |
| What is thermal expansion? | the expansion of matter when it is heated |
| In what direction does heat move? | From an area of higher temperature to an arear of lower temperature |
| What are three forms of heat transfer? | radiation, conduction, convection |
| What causes matter to change state? | when thermal energy is absorbed or released. Heating or cooling |
| What happens to a substance as its thermal energy increases? | it particles spread out and the substance expands |
| Renewable Sources of Energy | Solar, Hydro-Electricity, Wind, Nuclear, Tidal, Geothermal & Biomass |
| Our Primary Source of Energy | The Sun |
| What Energy Conversions occur when we eat food? | Stored Chemical energy changing to heat (thermal) and kinetic energy when we move. |
| What Energy Conversions occur when petrol is used in a car? | Chemical energy is changed to kinetic energy. |
| What Energy Conversions occur when a Car Battery is used? | Chemical energy to electrical energy. |
| How can you convert electrical energy to magnetic energy? | Wrap an insulated wire around a nail and pass an electrical current through it making an electromagnet. |
| Light Energy is converted into electrical energy using a ? | Solar Cell |
| Unit of Energy | Joule (J) |
| Unit of Power | Watt (W) |
| Unit of Work | Joule (J) |
Created by:
p-furl1
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