physic p1

  • Created by: Ronel.p
  • Created on: 08-01-18 21:59
how many joules is in a kila joul
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what a system
single object or a group of object
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an energy be transfered
mechanicaly(force doing work)/ electrically (work done moving charges) by heating or raiation( light sound
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closed system
when neithermatter nor every can enter or leave ( net change is 0)
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The energy possessed by a moving object
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The energy stored in the bonds between atoms
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the energy of the random motion of the particles in an object
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gravataional potential
the energy an object has due to its position in a gravataional field
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the energy an object has due to is position in a magnetic field
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elastic potential
the energy stored in an object when its shape is changed
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the energy an object has due to its position in an electric field
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the energy stored between he particles in the nuclei of atoms
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Specific heat capacity
The specific heat capacityof a material is the amount of energyit takes to increase the temperatureof 1 kgof that material by 1°C
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Specific heat capacity Equation
∆E =mc∆0
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the rate at which energy is transferred
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power eqaution
p= E/T
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The pricipleof conservation energy
the total amount of energy in a closed syste os constant ane energy can not bea vreated or destroyedonlt tranfer from one to another
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spread out or wated
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reduces the friction between the moving parts of a machine
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How can we reduce the amount of energy dissipated from a system
Using wheelsdecreases the friction between an object and the surface over which it is moving
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How can we reduce the amount of energy dissipated from a system
Making vehicles streamlined reduces the amount of air resistance exerted on them
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Reducing energy dissipation
The LOWER the thermal conductivity of a material, the LOWERthe rate of heat transfer through the material (by conduction) such cavity wall insulation as
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Efficiency is
the ratio of the useful output energy transfer to the total input energy transfer
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seful ouput energy tranfer /total input energy transfer
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• Biomass • Tidal • Hydroelectric • Wave • Wind • Solar • Geothermal
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• Coal • Oil • Gas • Nuclear
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(when they have been used up, there will be no more left as they take millions of years to form)
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negative if non renwable
Release greenhouse gaseswhen burnt (including carbon dioxide) which contribute to global warming • Release sulphur dioxide which can cause acid rain and breathing problemsin humans
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positive of renewable
Cheap and convenient
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positive of renwable
A renewable energy resource is one which will never run out • Renewable energy resources are either replenished immediately or can be replenished quickly
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The heat energyreleased when biofuels are burnt is used to generate electricity on a small scale or to heat buildings directly
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• Can produce large amounts of electricity in a reliableway • Expensive to build
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Can have negativesocialand environmental effects • Produce large amounts ofelectricity without the release of carbon dioxide (and in a reliableway
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The higher the wind speed, the greater the rate at which kinetic energy will be converted to electrical energy inside the generator of a wind turbine • Renewable and clean • Can be unreliable • Environmental and visual impact
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• The sunlightthat falls on a solar cell is used directly for the generation of electricity • Unreliable in some countries… ...but it can reduce the amount of energy required form the burning of fossil fuelsregardless of where it is used
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Clean and renewable • Geothermal energy schemes involve the use of water or steam which is heated naturally by processes within the Earth’s crust and below for the generation of electricity (or the direct heating of buildings)
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how many joules is in a megajoul
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what is energy transferred between
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what a system


single object or a group of object

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an energy be transfered


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closed system


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