Year 8 Science • AC9S8U05 • Authored homework
Track Energy Through a System
Classify energy as kinetic or potential and trace transfers and transformations through real systems. Answer in full sentences where useful, and use evidence or examples in longer responses.
Part A
Short-answer questions
Define kinetic energy.
Define potential energy.
Classify the energy stored in a stretched rubber band as kinetic or potential and explain why.
What is an energy transfer?
What is an energy transformation?
Give one example of chemical potential energy being transformed into another form.
Why is heat often described as energy transferred to the surroundings?
Explain what is meant by an energy system boundary.
Name two forms of energy involved when a ball rolls down a ramp.
Write one sentence using the idea that energy is conserved.
Part B
Long-answer questions
Trace the energy changes in a torch from battery to light and heat. Identify transfers and transformations.
Explain the energy changes when a roller-coaster car moves from the top of a hill to the bottom.
Compare useful energy output and wasted energy in one household device.
Draw an energy flow diagram for a bouncing ball and explain why it does not bounce back to the original height.
A student says, “Energy disappears when a phone battery goes flat.” Correct this idea using conservation of energy.
Describe energy transfers in a simple electric circuit with a battery, wires and a lamp.
Explain how friction changes the energy story in a moving system.
Use a food chain example to explain how energy is transferred between living things.
Evaluate which parts of an energy transformation are useful and which are dissipated for a toaster, fan or car.
Write a full explanation of one everyday system, identifying the starting energy store, transfers, transformations and final energy forms.
Part C
Research and understanding task
Research one device or natural system that transforms energy, such as a solar panel, hydroelectric dam, bicycle, wind turbine or human body during exercise. Explain the energy pathway using a diagram.