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P1
| Question | Answer | ||
|---|---|---|---|
| What is a system | An object or group of objects | ||
| What is a closed system | A system in which energy can't enter or leave | ||
| Define kinetic energy | The energy stored in a moving object | ||
| What is the equation for kinetic energy | Ek=1/2mv^2 | ||
| Define elastic energy | The energy stored in a stretched object | ||
| What is the equation for elastic energy | Ee=1/2ke^2 | ||
| Define gravitational potential energy | The energy stored due to an objects hieght above the ground | ||
| What's the equation for gravitational potential energy | Ep=mgh | ||
| ∆E= | mc∆theta | ||
| Define specific heat capacity | The energy required to raise the temperature by 1°C | ||
| Define thermal energy | The energy stored due to an objects temperature | ||
| Define power | The rate of energy transfer or the rate at which work is done | ||
| What is the equation for power | Power=energy transferred÷time or Power=work done÷time | ||
| What is the law for conservation of energy | Energy cannot be created or destroyed only transferred | ||
| Friction causes... | ... energy to be transferred to thermal enery | ||
| How can we reduce unwanted energy transfer | Reduce friction | ||
| How can we reduce friction | Use a lubricant Remove air particles | ||
| What happens when we raise thermal conductivity | The rate of energy transfer increases | ||
| How can we reduce the thermal energy transfer of a building | Use materials with low thermal conductivity or build thicker walls | ||
| What is the equation for efficiency | Useful energy/total energy | ||
| What are the 3 types of fossil fuels | Coal oil and gas | ||
| What are the advantages of fossil fuels | Reliable, release lots of energy, abundant, cheap, versatile | ||
| What are the disadvantages of fossil fuels | Releases CO2, non renuable, releases pollutants | ||
| What are the advantages of nuclear power | No CO2, reliable | ||
| What are the disadvantages of nuclear power | Radioactive materials, decommissioning takes a long time, radioactive waste | ||
| What is a renuable energy source | A resource that can be replenished as we use it | ||
| What are the 7 types of renuable energy sources | Wind, solar, hydroelectric, tidal, biofuels, geothermic, wave | ||
| What are the advantages of renuables | Don't run out,no CO2 emissions, hydroelectric tidal wave and geothermic are reliable | ||
| What are the disadvantages of renuables | Hard to use for transport, hydroelectric and tidal can destroy habitats, wind and solar are unreliable |
Created by:
Liam P
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