Physics GCSE

• What unit is energy measured in?

  Joules (J)
• What are the 8 stores of energy?

  Thermal, kinetic, gravitational potential, elastic potential, chemical, magnetic, electrostatic, nuclear
• What are some ways in which energy can be transferred?

  Electrically, by heating, mechanically and radiation
• When energy is transferred to its surroundings, we say it is...

  dissipated
• What does the principle of conservation of energy state?

  Energy is neither created nor destroyed, it is transferred
• What can be used to reduce friction between two surfaces and reduce thermal energy loss?

  Lubricant
• What are four signs of a chemical reaction?

  1. Transfer of energy

  2. Change in color

  3. Production of gas

  4. Formation of a precipitate
• What happens to energy when a chemical reaction takes place?

  It is transferred between the reaction and the surroundings
• What happens during an exothermic reaction?

  Energy is released in the form of heat. This is usually proven by a rise in temperature
• What happens during an endothermic reaction?

  Energy is taken in from the surroundings usually in the form of heat. Can be proven by a fall in temperature
• Examples of an exothermic reaction


  Combustion, oxidation, neutralisation, self heating cans and hand warmers
• Examples of an endothermic reaction

  Thermal decomposition, photosynthesis and the reaction of citric acid and sodium hydrogencarbonate. And some sports injury packs
• What does the term 'activation energy' mean?

  The minimum amount of energy required for a chemical reaction to start
• Define power


  the rate at which work is done
• What unit is power measured in?

  Watts (W)
• What is thermal conductivity a measure of?

  The rate of transfer of energy
• Name three renewable energy sources.

  Wind power, solar power, bioenergy
• Name three non renewable energy sources.

  Coal, oil, natural gas