GCSE Physics Specification

OCR A J249

Section P7.1: Work done

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#P7.1a

describe for situations where there are energy transfers in a system, that there is no net change to the total energy of a closed system (qualitative only)

the law of conservation of energy

#P7.1b

describe all the changes involved in the way energy is stored when a system changes for common situations

an object projected upwards or up a slope, a moving object hitting an obstacle, an object being accelerated by a constant force, a vehicle slowing down, bringing water to a boil in an electric kettle

#P7.1c

describe the changes in energy involved when a system is changed by heating (in terms of temperature change and specific heat capacity), by work done by forces, and by work done when a current flows

#P7.1d

make calculations of the energy changes associated with changes in a system, recalling or selecting the relevant equations for mechanical, electrical, and thermal processes; thereby express in quantitative form and on a common scale the overall redistribution of energy in the system

work done by forces, current flow, through heating and the use of kW h to measure energy use in electrical appliances in the home

#P7.1e

make calculations of the energy changes associated with changes in a system, recalling or selecting the relevant equations for mechanical, electrical, and thermal processes; thereby express in quantitative form and on a common scale the overall redistribution of energy in the system

work done by forces, current flow, through heating and the use of kW h to measure energy use in electrical appliances in the home

#P7.1f

calculate the amounts of energy associated with a moving body, a stretched spring and an object raised above ground level