Energy – Review Questions – Answer these and you’ll nail the test!
Nature of energy
1. What is energy?
2. List two things that are known about energy.
3. What is the unit of measurement we use to express the amount of ‘energy’ (or ‘work’)
done or stored?
4. Can you explain the first law of thermodynamics? What does it say? Give an example.
5. State the Law of Conservation of Energy and provide an example
Classification of energy
6. What are the two categories all forms of energy can be classified (grouped) as?
7. How can we further sub-classify forms of energy? ... What are the different forms of
energy in each of the two categories?
8. What are some examples of each form?
9. The energy of a moving object is called:
10. List three examples that explain elastic potential energy
11. What forms of energy do we (humans) receive from the sun?
12.
Energy transfer and transformation
13. What is the difference between energy transfer and energy transformation?
14. How would you explain the transfer of energy? What happens to energy when it’s
transferred? What would be some examples?
15. How would you explain the transformation of energy? What happens energy when it is
transformed? What would be some examples?
16. Jordan watches a music video clip on his iPhone. Explain the energy transformations
that are happening.
17. During an explosion, chemical potential energy is converted into...
18. When you clap your hands, the kinetic energy is transformed into...
19. List three examples that explain transformation of chemical energy into kinetic energy.
20. When a car skids to a stop, its kinetic energy is mostly transformed into
21. The kinetic energy needed to make a car move along a flat road, to launch a rocket into
outer space or to operate a small calculator is converted from:
22. Draw an annotated diagram that explains the energy transfer and transformation that
happens during the launch of a Water Rocket. How would you express this through
flow chart diagram?
23. List three types of energy that are present when a match is lit.
24. Draw a labelled diagram that compares the gravitational potential energy (GPE) and
kinetic energy (KE) of vehicles on a roller coaster ride at different positions in the ride.
25.
Heat transfer
26. Heat flows from areas of...
27. What are three types of heat transfer and how do these work?
28. Draw an energy flow chart diagram that explains the energy transfer and
transformation from the sun to any of the building features utilised in the Earth Ship
design.
29. List 3 examples of heat transfer utilised in the Earthship design.
30. The transfer of heat by the passing of vibrations from particle to particle in a
substance is called...
Energy efficiency
31. What does it mean to be energy efficient? Give an example. Define the term energy
efficiency.
32. How would you calculate energy efficiency?
33. A particular electric knife is 20% efficient. If 50 J of energy is supplied to the knife, the
number of joules that is then transformed into kinetic energy is:
34. The number of stars found on an energy rating label indicate...
35. When using a hair dryer, list the form of initial energy as well the forms of useful and
waste energy
Waves
36. What is the difference between sound and light waves?
Sound
37. What is sound? How does sound energy work?
38. How would you explain what sound is to a person who is deaf?
39. Explain why sound can’t travel through the vacuum of space.
40. Sound travels at approximately 340 m/s and light at 300 000 km/s. When a lightning
bolt flashes you see the light virtually instantaneously but you don’t hear the thunder
for several seconds because sound is so much slower than light. If you hear the
thunder 5 seconds after seeing the lightning flash how far away from you is the storm?
Light
41. What is light? How does light travel?
42. What is the difference between low and high wavelengths?
43. Draw a labelled diagram of high and low frequency wave; explain what is meant by
frequency. In each case indicate (draw/section off) what you would call wavelength.
Explain the relationship between wavelength and frequency.
44. Two mirrors are shown below. What do we call each of these mirrors; explain what
happens to light rays when they hit each mirror.
A
B
45. What is short sightedness and why does it occur? Draw a labelled diagram showing
how short sightedness it can be corrected through the use of glasses. Explain how it
works.
46. What happens to light when it hits a flat mirror?
47. What is refraction and why does it happen?
48. Explain what is happening to light when you see a rainbow.