OCR 21st Century P2

    Cards (57)

    • What are the different sources of energy mentioned?
      Thermal, light, chemical, nuclear, sound, kinetic, elastic, potential
    • What is thermal energy?
      Energy in heated objects like kettles
    • How is light energy used?
      Helps to see, like in bulbs and torches
    • What is electrical energy?
      Energy due to the flow of charge or current
    • What is chemical energy?
      Energy stored in chemical bonds, like food
    • What is sound energy?
      Energy due to vibrations, like in speakers
    • What is nuclear energy?
      Energy stored in the nucleus of an atom
    • What is kinetic energy?
      Energy due to movement, like in roller coasters
    • What is potential energy?
      Energy due to position, like a raised ball
    • What is elastic energy?
      Energy stored in stretched objects like springs
    • What does the law of conservation of energy state?
      Energy is neither created nor destroyed
    • How does energy transfer occur in a pendulum?
      Kinetic energy converts to potential energy
    • What happens to energy in a roller coaster?
      Potential energy converts to kinetic energy when falling
    • What is the formula for work done?
      Work done = force × distance
    • What is the unit of work done?
      Joules
    • What is the formula for potential energy?
      Potential energy = mgh
    • What does 'm' represent in the potential energy formula?
      Mass of the object in kilograms
    • What is the value of 'g' in potential energy calculations?
      10 m/s²
    • What is the formula for kinetic energy?
      Kinetic energy = ½ mv²
    • What is the formula for elastic potential energy?
      Elastic potential energy = ½ k
    • What is the formula for energy?
      Energy = power × time
    • What is the unit of power?
      Watts
    • What is the formula for efficiency?
      Efficiency = (useful output / total input) × 100
    • How do you calculate work done with a 2 Newton force over 2 meters?
      Work done = 4 joules
    • How do you calculate kinetic energy for a 2 kg mass at 3 m/s?
      Kinetic energy = 9 joules
    • How do you calculate potential energy for a 2 kg mass at 5 meters?
      Potential energy = 100 joules
    • How do you calculate energy dissipated by a 10 volt bulb in 2 seconds?
      Energy = 1200 joules
    • What does Hooke's Law state?
      Force is directly proportional to extension
    • What is the relationship between force and extension in Hooke's Law?
      Linear relationship until a limit
    • What is energy efficiency?
      Ratio of useful output to total input
    • How can friction be prevented?
      Lubricate, paint, or smooth surfaces
    • What are the three methods of heat transfer?
      Conduction, convection, radiation
    • What is conduction?
      Heat transfer through direct contact of particles
    • What is convection?
      Heat transfer through fluid movement
    • What is radiation?
      Heat transfer through electromagnetic waves
    • What is the greenhouse effect?
      Warming of Earth's surface by greenhouse gases
    • What do greenhouse gases do?
      Trap heat and prevent it from escaping
    • What are renewable energy sources?
      Sources that can be replenished and won't run out
    • What are non-renewable energy sources?
      Sources that cannot be replenished and will run out
    • What is biofuel?
      Fuel generated from plant resources
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