physics p1

• What is the formula to work out kinetic energy?


  Kinetic energy = ½ x mass x velocity^2
• What is the standard unit for mass?

  kilogram (kg)
• What is the standard unit for speed?

  Metres per second (m/s)
• What is the standard unit for kinetic energy?


  Joules
• What is the standard unit for elastic potential energy


  Joules
• What is the standard unit for the spring constant?

  Newtons per metre (N/m)
• What is the standard unit for extension in the elastic potential energy equation?


  Metres
• What is the formula for gravitational potential energy


  G.P.E= mass x gravitational field strength x height
• What is the standard unit for gravitational field strength?


  N/kg
• What is the standard unit for specific heat capacity?

  Joules per kilogram per degree Celsius(J/Kg .C)
• What is this the definition of: The amount of energy required to raise the temperature of 1kg of a substance by 1 oC

  Specific Heat Capacity
• What is defined as the rate at which energy is transferred or work is done?

  Power
• What is the standard unit for power?

  Watts (W)
• What is the equation that links power, energy transferred and time?

  Power= Energy transferred/Time
• What is the equation that links power, work done and time?

  Power= Work done/Time
• What is energy transferred the same as?

  work done
• An energy transfer of 1 joule per second is equal to a power of?

  1 Watt
• If two electric motors both lift the same weight, the same height which will do it faster?

  The more powerful one
• Energy can be transferred, stored or dissipated but cannot be


  Created or destroyed
• In what type of system is there no net change to the total energy?

  Closed
• How can we reduce unwanted energy transfers?

  -Lubrication

  -Use of thermal insulation
• How does increasing the thermal conductivity of a material affect the rate of energy transfer by conduction?

  It increases it
• What factors affect the rate of cooling of a building?

  -Thickness of walls

  -Thermal conductivity of walls
• How do you work out efficiency from input and output energy?

  Efficiency = Useful output energy transfer/Total input energy transfer
• How do you work out efficiency from power input and output

  Efficiency=Useful power output/Total power input
• What are the three main types of fossil fuels?

  coal, oil, natural gas
• Name the main non-renewable energy resources?

  Fossil fuels, nuclear fuel
• Name 6 renewable energy resources

  Biofuel

  Wind

  Hydro-electricity

  Geothermal

  Tidal

  Solar

  Water waves
• What type of resource is one that is being replenished as it is used?

  Renewable
• What does an OPEN SWITCH look like?

  
• What does a CLOSED SWITCH look like?

  
• What does a CELL look like?

  
• What does a BATTERY look like?

  
• What does a DIODE look like?

  
• What does the Graph of a DIODE look like

  
• What does a diode do?

  Allows current to flow in one direction only
• What does a RESISTOR look like

  
• What does the graph of a RESISTOR look like?

  
• What does a VARIABLE RESISTOR look like?

  
• What does a variable resistor do?

  Allows the current to be varied