Topic 1 - Energy

• What is energy described as in the text?

  An idea that predicts object interactions
• What does the conservation of energy state?

  Energy cannot be created nor destroyed only transferred
• What can energy be turned into according to the text?

  Mass
• What are the different stores of energy referred to as?

  Types of energy
• How is energy measured?

  In Joules
• How do you calculate kinetic energy?

  Using $e =$$\frac{1}{2} mv^2$
• What happens to kinetic energy as an object's speed increases?

  Kinetic energy increases
• How is gravitational potential energy calculated?

  Using $e =$$mgh$
• What does a higher height indicate about gravitational potential energy?

  More gravitational potential energy available
• What is the formula for elastic potential energy?

  $e =$$\frac{1}{2} kx^2$
• What does thermal energy change indicate about particle movement?

  Particles move faster with increased thermal energy
• What is specific heat capacity?

  Energy needed to raise 1 kg by 1°C
• What does the symbol $\Delta$ represent in the thermal energy equation?


  Change in temperature
• How is power calculated?

  $P =$$\frac{E}{T}$
• What is the unit for power?

  Watts
• How do you calculate efficiency?

  Useful energy out divided by total energy in
• If a laptop uses 200 W but only supplies 120 W of useful power, what is its efficiency?

  0.6 or 60%
• What happens to energy in a closed system?

  No energy is lost to surroundings
• What are finite energy sources?

  Sources that cannot be replenished
• What is an example of a renewable energy source?

  Wind power
• What are the types of energy stores mentioned in the text?

  • Kinetic energy
  • Gravitational potential energy (GPE)
  • Elastic potential energy
  • Thermal energy
  • Chemical potential energy
• What is the relationship between gravitational potential energy and kinetic energy in a closed system?

  • GPE decreases as KE increases
  • Energy is conserved
  • GPE lost equals KE gained
• What is the practical method to find specific heat capacity?

  1. Heat the material
  2. Measure temperature change
  3. Calculate energy input
  4. Use $e =$$mc\Delta T$ to find specific heat capacity
• What are the effects of insufficient insulation in buildings?

  • Heat loss through walls, windows, doors
  • Increased energy consumption
  • Higher heating costs
• What is the difference between energy sources and energy stores?

  • Energy sources: where energy is harnessed
  • Energy stores: where energy is held
• What are examples of finite energy sources?


  • Fossil fuels (coal, oil, gas)
  • Nuclear fuel (uranium)
• What are examples of renewable energy sources?

  • Wind power
  • Hydroelectric power
  • Solar power
  • Geothermal power
  • Biofuels
• What is the first topic covered in the video?

  Energy topic of GCSE physics
• Why should viewers pause the video?

  To take notes for exam preparation
• How many different energy stores are mentioned?

  Eight different energy stores
• Name three energy stores mentioned in the video.

  Kinetic, thermal, gravitational potential
• What happens to gravitational potential energy when a ball is dropped?

  It decreases as kinetic energy increases
• What is the equation for kinetic energy?

  E = $\frac{1}{2}mv^2$
• What does the variable 'm' represent in the kinetic energy equation?

  Mass of the object
• What is the equation for gravitational potential energy?

  E = mgh
• What does 'g' represent in the gravitational potential energy equation?

  Gravitational field strength
• What is the definition of specific heat capacity?

  Energy to raise 1 kg by 1°C
• What is the equation for calculating change in energy using specific heat capacity?

  Change in energy = mcΔT
• What does the term 'conservation of energy' mean?

  Energy cannot be created or destroyed
• What is power defined as?

  Rate of doing work