P8.1d explain methods of measuring human reaction times and recall typical 88-9 74-5 90-1, 212-3 results P8.1e explain the factors which affect the distance required for road 88-9 74-5 90-1, 212-3 transport vehicles to come to rest in emergencies and the implications for safety To include factors that affect thinking and braking distance and overall stopping distance P8.1f estimate how the distances required for road vehicles to stop in an 88-9 74-5 90-1, 212-3 emergency, varies over a range of typical speeds P8.1g explain the dangers caused by large decelerations 88-9 74-5 90-1, 212-3 P8.1h estimate the forces involved in typical situations on a public road 88-9 74-5 90-1, 212-3 P8.1i estimate, for everyday road transport, the speed, accelerations and 88-9 74-5 90-1, 212-3 forces involved in large accelerations P8.2 Powering Earth P8.2a describe the main energy sources available for use on Earth, compare 21-3 18-9 23-5, 156-7 the ways in which they are used and distinguish between renewable and non-renewable sources To include fossil fuels, nuclear fuel, bio-fuel, wind, hydro-electricity, tides and the Sun P8.2b explain patterns and trends in the use of energy resources 21-3 18-9 23-5, 156-7 To include the changing use of different resources over time P8.2c recall that, in the national grid, electrical power is transferred at high 37 32 39, 170 voltages from power stations, and then transferred at lower voltages in each locality for domestic use P8.2d recall that step-up and step-down transformers are used to change 37 32 39, 170 the potential difference as power is transferred from power stations P8.2e explain how the national grid is an efficient way to transfer energy 37 32 39, 170 P8.2f link the potential differences and numbers of of a transformer to 37 32 39, 170 the power transfer involved; relate this to the advantages of power transmission at high voltages
P8.1d explain methods of measuring human reaction times and recall typical results 88-9 74-5 90-1, 212-3 P8.1e explain the factors which affect the distance required for road transport vehicles to come to rest in emergencies and the implications for safety To include factors that affect thinking and braking distance and overall stopping distance 88-9 74-5 90-1, 212-3 P8.1f estimate how the distances required for road vehicles to stop in an emergency, varies over a range of typical speeds 88-9 74-5 90-1, 212-3 P8.1g explain the dangers caused by large decelerations 88-9 74-5 90-1, 212-3 P8.1h estimate the forces involved in typical situations on a public road 88-9 74-5 90-1, 212-3 P8.1i estimate, for everyday road transport, the speed, accelerations and forces involved in large accelerations 88-9 74-5 90-1, 212-3 P8.2 Powering Earth P8.2a describe the main energy sources available for use on Earth, compare the ways in which they are used and distinguish between renewable and non-renewable sources To include fossil fuels, nuclear fuel, bio-fuel, wind, hydro-electricity, tides and the Sun 21-3 18-9 23-5, 156-7 P8.2b explain patterns and trends in the use of energy resources To include the changing use of different resources over time 21-3 18-9 23-5, 156-7 P8.2c recall that, in the national grid, electrical power is transferred at high voltages from power stations, and then transferred at lower voltages in each locality for domestic use 37 32 39, 170 P8.2d recall that step-up and step-down transformers are used to change the potential difference as power is transferred from power stations 37 32 39, 170 P8.2e explain how the national grid is an efficient way to transfer energy 37 32 39, 170 P8.2f link the potential differences and numbers of of a transformer to the power transfer involved; relate this to the advantages of power transmission at high voltages 37 32 39, 170
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