Physics

• What is SHC ( specific heat capacity)?

  The amount of energy required to raise the temperature of 1kg of the substance by 1 degrees.
• The higher the thermal conductivity of a material, the higher the rate of energy transfer by conduction across that material.
• How do builders prevent the loss of heat in a home?

  1. Pack the cavity with insulating material that has very low thermal conductivity
  2. double glazed windows which have low thermal conductivity
• What is the equation of specific heat capacity?

  Change in thermal energy (J) / mass x temperature change = Specific heat capacity (J/kg degrees)
• What is radiation?

  Energy released in the form of a particle or electromagnetic waves.
• What can be used to reduce the thermal conductivity of the walls and roof?

  thermal insulators
• What causes enzyme to denature?

  Extremes of pH or at very high temperatures
• What are enzymes?


  Protein molecules that catalyse specific reactions in organisms
• What is diffusion?

  Diffusion is the movement of particles from an area of high concentration to an area of low concentration.
• Definition of active transport….


  Active transport moves substances from a more dilute solution to a more concentrated solution (against concentration gradient)
• What is renewable energy?

  Energy from natural sources that never runs out
• What is non - renewable energy?

  Energy from natural source that runs out
• Name 6 energy stores…

  1. Gravitational potential energy
  2. thermal energy
  3. Elastic potential energy
  4. Nuclear energy
  5. Electric
  6. Chemical energy
• Can energy be stored and transferred by an object?

  Yes
• Is this statement true: ‘ Energy can be created and destroyed’

  False
• Is this statement true: Work done = energy transfer

  True
• Work done = Force(N) x Distance (M)
• G.P.E = mass (kg) x gravity (N/kg) x height (m)
• kinetic energy = 0.5 x mass (kg) x velocity squared (m/s)
• What is an I.V. ?

  What you change
• What is the D.V. in a practical?

  What you measure
• What is the C.V. in a practical?

  What you keep the same
• Energy transferred = mass(kg) x specific heaat capacity( J/kg degrees) x change in temp( degrees)
• Power = energy transferred / time taken to transfer energy (Watts)
• A substance must gain energy in order to change shape from solid into liquid into gas
• What is health?

  State of physical, mental and social well being
• Definition of convention…

  When a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy
• What is the definition of conduction?

  Transfer of heat through physical contact
• Factors affecting rate of temperature change:s

  1. Amount of energy supplied
  2. !ass of the substance
  3. Material of the substance
• What is Gas pressure caused by?

  Particles colliding with the walls of the container
• What is Latent heat of fusion?

  Amount of heat needed to cause a phase change between a solid and liquid
• What is Latent heat of Vaporisation?

  Amount of heat to cause a phase change between a liquid and gas
• What is an Alpha particle?


  A helium nucleus made from 2 neutrons and 2 protons
• What is a beta particle?

  An electron or positron emitted from the nucleus (smaller than an alpha particle)of an atom during radioactive decay - also known as beta ray or beta radiation
• What is a gamma ray?


  Also known as gamma radiation is a pen form of high energy electromagnetic radiation - occurs when light has very high energy and naked to human eye
• What is the penetration power (ability of radiation to pass through matter) of an alpha particle ?

  Stopped by paper or a few cm of air
• What is the penetration power of a beta particle?

  Stopped by a few mm of aluminium
• What is the penetration power of a gamma ray?

  Reduced by several cm of lead or several metres of concrete
• What is half time?

  The time taken for half of a radioactive sample to decay