4.1.1 Energy changes in a system

Define a system as an object or group of objects and state examples of changes in the way energy is stored in a system

Describe how all the energy changes involved in an energy transfer and calculate relative changes in energy when the heat, work done or flow of charge in a system changes

Use calculations to show on a common scale how energy in a system is redistributed

Calculate the kinetic energy of an object by recalling and applying the equation: [ Ek = ½mv2 ]

Calculate the amount of elastic potential energy stored in a stretched spring by applying, but not recalling, the equation: [ Ee= ½ke2 ]

Calculate the amount of gravitational potential energy gained by an object raised above ground level by recalling and applying, the equation: [ Ee = mgh ]

Calculate the amount of energy stored in or released from a system as its temperature changes by applying, but not recalling, the equation: [ ΔE = mcΔθ ]

Define the term 'specific heat capacity'

Define power as the rate at which energy is transferred or the rate at which work is done and the watt as an energy transfer of 1 joule per second

Calculate power by recalling and applying the equations: [ P = E/t & P = W/t ]

Explain, using examples, how two systems transferring the same amount of energy can differ in power output due to the time taken