physics ࣪˖ ִ

• what is the measurment of gravity on earth?


  9.8m/s unless specified otherwise
• state one advantage and one disadvantage of using fossil fuels

  advantage: reliable, on demand electricity

  disadvantage: not renewable, contributes to global warming
• state one advantage and one disadvantage of using geothermal energy

  advantage: renewable, reliable

  disadvantage: only used where there is volcanic activity close to the surface, can create unstable land
• what are examples of some energy resources?

  geothermal

  solar

  nuclear

  tidal

  water/hydroelectric

  wind

  fossil fuels
• state one advantage and one disadvantage of using wind powered energy


  advantage: renewable, little space taken up, low cost

  disadvantage: unreliable, can cause noise pollution & visual pollution
• which equation links area, force and pressure?

  pressure = force ÷ area
• describe the test for hydrogen gas.

  test - burning / lit splint

  result - burns with a (squeaky) pop sound
• direction of vibrations in transverse waves

  the oscillations (vibrations) are perpendicular to the direction of wave travel (e.g., light waves, water waves).
• direction of vibrations in longitudinal waves

  the oscillations are parallel to the direction of wave travel (e.g., sound waves, seismic P-waves)
• equation for wave speed

  wave speed = frequency x wave length