Form of Energy
What type of energy is stored in a stretched rubber band?
What is Elastic potential energy
What type of energy transfer happens when you toast bread in a toaster?
Thermal energy to Chemical energy
In a hydroelectric dam, what energy form is transformed into electricity?
Kinetic energy of running water
Why do scientists from different countries often work together on energy projects?
Because big problems like climate change require global resources, expertise, and shared knowledge.
What law states that energy cannot be created or destroyed?
The law of conservation of energy
What form of energy is produced when you clap your hand?
What is Sound energy
In a bouncing ball, what energy is stored at the highest point?
What is gravitational potential energy
A car engine burns fuel. What two main energy transformations occur?
Chemical energy of the fuel transformed into thermal energy, then the thermal energy is transformed into mechanical energy
Name one benefit of regenerative braking systems for society.
Reduces fuel consumption → saves money and lowers carbon emissions.
In a cyclist riding uphill, what happens to their kinetic and potential energy stores?
The kinetic energy is transformed into the gravitational potential energy
A torch uses chemical energy in batteries. What two other energy forms are involved when it is turned on?
What is light energy and thermal energy
Why does a swing eventually slow down even without anyone stopping it?
What is air resistance/friction
In an electric car using regenerative braking, what energy is transformed when the car slows down?
Electrical energy to kinetic energy
How does solar-powered desalination help solve a contemporary problem?
Provides fresh drinking water in areas with water scarcity without relying on fossil fuels.
Give one example of wasted energy in a washing machine.
Thermal energy
Name one form of potential energy other than gravitational potential.
What is chemical potential energy
A fan is supplied with 2200 J of electrical energy and only produces 600 J of useful kinetic energy. How much is wasted?
1600 J
Explain why not all gravitational potential energy is transformed into kinetic energy in a roller coaster.
Energy is wasted as thermal energy
Explain how reducing greenhouse gas emissions benefits two different groups in society.
Improves public health (less pollution) and helps governments meet climate goals.
Why might a country invest in renewable energy even if fossil fuels are cheaper?
To reduce carbon emissions, meet sustainability goals, or ensure long-term energy security.
A firework explodes in the sky. Identify at least three forms of energy released.
What is sound energy, light energy and thermal energy.
Describe one way the efficiency of a simple system like a light bulb could be improved.
Use a high wattage bulb that produce more light with same amount of electrical energy.
Explain the energy transformations in a solar-powered desalination system from sunlight to clean water.
Light energy from the sun is transformed into electrical energy, the electrical energy will either be transformed into thermal energy or kinetic energy of water particles.
Describe one challenge scientists face when collaborating internationally on energy projects.
political disagreements
A team of scientists invents a new battery that stores twice as much energy. Reflect on one positive and one negative implication for society.
Positive: Cheaper, longer-lasting renewable energy storage. Negative: Could increase electronic waste, mining of rare materials, or inequality in access.