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53 Cards in this Set
- Front
- Back
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Kinetic Energy Formula
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1/2 * mass * velocity squared
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Gravitational Potential Energy Formula
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height * mass * gravity
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What is kinetic energy measured in ?
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Joules
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What is potential energy measured in ?
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Joules
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What is mass measured in ?
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Kilograms
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What is length measured in ?
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Meters
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What is time measured in ?
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Seconds
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What is temperature measured in ?
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Celsius or Kelvin
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What is electric current measured in ?
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Ampere
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What is light intensity measured in ?
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Candleir (cd)
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What is the amount of substance measured in ?
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Moles
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Define Mechanical Energy ?
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It is the sum of both potential and kinetic energy.
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State the Law of Conservation
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Energy cannot be created nor destroyed; but it can be changed from one form to another.
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List the 9 forms of energy
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-Magnetic
-Kinetic -Heat -Gravitational -Chemical -Sound -Elastic -Electrical -Nuclear |
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Energy Efficiency Formula
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efficiency = useful energy output / total energy output
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Work done formula
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Work done = force * distance
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Power formula
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Power = work done/time taken
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What is power measured in ?
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Watts
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Name the 3 ways of transferring heat
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-Conduction
-Convection -Radiation |
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What is double insulation ?
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Windows consisting of two glass panels with air trapped inside because air is a good insulator.
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Where does conduction no exist ?
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In a vacuum
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How are molecules packed in a solid ?
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Closely Packed
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How are molecules packed in a liquid?
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Loosely packed
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How are molecules packed in a gas ?
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Move randomly; not packed at all.
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Describe the changes in IMF levels as solids turn to liquids and then to gases.
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The IMF holding the atoms together becomes weaker and weaker and eventually the atoms are free from each other at the gas stage.
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Describe the shape and structure of a solid ?
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Solids have a definite shape and structure.
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Describe the shape and structure of a liquid ?
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Liquids take the shape of the container
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Describe the shape and structure of a gas ?
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No shape or structure as particles move freely.
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What is the random movement of gas molecules called ?
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Brownian Motion
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Density Formula
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Density = mass/volume
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What is density measured in ?
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kg/m3
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Pressure Formula in Solids
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Pressure = force/area
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Pressure Formula in Liquids
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Pressure = height * density * gravity
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What is pressure measured in ?
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Pascals (pa)
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What is relation between depth and pressure of liquids ?
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The greater the depth, the greater the pressure.
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Define a Hydrometer
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A hydrometer is used to measure the density of milk and other liquids by floating to different depths in different liquids depending on their densities.
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what is the most common form of waste energy ?
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Heat energy
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Why does the dam wall need to be thicker at its base?
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The pressure at the bottom is greater so the wall must be stronger.
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Why does the boat float?
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Upthrust from the water is spread over a large area so the upward force is greater than the weight.
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Why must the diver breathe out as he surfaces?
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When the diver breathes at depth the air is at a higher pressure. As he surfaces the water pressure decreases so the air in his lungs would expand and burst his lungs.
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What is a convection current ?
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It is the path taken by rising hot fluids and sinking cold fluids.
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What type of air breeze is experienced during the day ?
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Sea Breeze
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What type of air breeze is experienced during the night ?
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Land Breeze
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Give examples of non-renewable resources
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Coal, Gas and Oil.
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Describe the energy change in a wind turbine
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Kinetic energy --> Electrical energy
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Describe the energy changes in a hydroelectric power plant
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Gravitational Potential energy --> Kinetic energy --> Electrical energy
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Describe the energy change in a wave power plant
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Kinetic Energy --> Electrical energy
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Describe the energy change in a tidal plant
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Gravitational Potential energy --> Kinetic energy --> Electrical energy
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Describe the energy change in a geothermal power plant
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Thermal energy --> Kinetic energy --> Electrical energy
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Describe the energy change in solar heating
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Thermal energy --> Kinetic energy --> Electrical energy
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Describe the energy change in solar panels
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Light energy --> Electrical Energy
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Describe the energy change in the burning of fossil fuels
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Chemical energy-->Thermal energy --> Kinetic energy --> Electrical energy
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Describe the energy change in a nuclear power plant
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Nuclear energy --> Thermal energy --> Kinetic energy --> Electrical energy
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