Physics Paper 1 - energy 0.0 / 5 ? PhysicsEnergyGCSEAQA Created by: LaurenBrittainCreated on: 02-04-19 22:06 What is the equation for kinetic energy? 1/2 x mass x velocity^ 1 of 16 What is the equation for elastic potential energy? 1/2 x spring constant x extension^ 2 of 16 What is the equation for gravitational potential energy? mass x gravity x height 3 of 16 What is specific heat capacity? The energy required to raise the temperature of 1kg of a substance by 1⁰C 4 of 16 What is the equation linking specific heat capacity and energy? Energy = mass x SHC x temperature change 5 of 16 What is power? The rate at which energy is transferred OR the rate at which work is done 6 of 16 What is the equation for power? Power = energy/time OR work done/time 7 of 16 What is the key rule for energy? Energy cannot be created or destroyed, only transferred, stored or dissipated 8 of 16 Name one way of reducing energy waste. Using oil as lubrication in a motor - reduces friction, so less energy is lost (as heat) through friction 9 of 16 Name another way of reducing energy waste. Thermal insulation - double glazing: less useful thermal energy lost 10 of 16 What is efficiency? The ratio of the useful work done by the machine (eg) to the energy supplied to it 11 of 16 What is the equation for efficiency? efficiency = useful energy output/total energy input OR useful power input/total power output 12 of 16 How can the efficiency of a system be increased? Reduce waste output (lubrication, thermal insulation, etc.) and also recycling waste output 13 of 16 What are the two main non-renewable energy sources? Nuclear fuel and fossil fuels 14 of 16 What are the seven main renewable energy sources? Biofuel, solar, wind, hydro-electricity, geothermal, tidal and water waves 15 of 16 Why isn't renewable energy the most reliable source? Wind power is dependent on weather conditions and solar doesn't work during night or bad weather 16 of 16
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