*Go get the physics book with the soccer ball on it. Name ______

Energy- Chapter 5

1.  Define energy:

2.  Review: Look back to the last chapter in the book. What is work? Why is energy measured in the same units as work?

3.  What are the five main forms of energy, how does it work (definition?) and give one example.

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5.

4.  It is energy you must pay for on your electric bill. Electric companies usually express the total amount of energy used in kilowatt-hours (kWh) – the flow of 1 kilowatt of electricity for 1 hour. How many joules of energy do you get when you pay for 1 kWh? (1 joule = 1 watt x 1 second; 1 kW = 1000 watts; 1 hour = 3600 seconds).

5.  What is kinetic energy? Give three examples.

6.  What is the mathematical equation for kinetic energy?

7.  Which of the two factors in the numerator will have a greater effect on kinetic energy? Why?

  1. (Use the table on the bottom of page 113 to help you if you need to)

8.  When does a skier have more kinetic energy, when skiing downhill or cross-country? Explain.

9.  What is potential energy? Give three examples.

10.  What is an energy conversion?

11.  Please come up with two examples of kinetic-potential energy conversions.

12.  Answer the five questions in the “Activity: Thinking” box on page 117.

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13.  Name an example of something that uses each conversion.

  1. Electrical energy to heat energy
  2. Mechanical energy to heat energy
  3. Chemical energy to heat energy
  4. Chemical energy to mechanical energy

14.  Why do light bulbs get hot when they’ve been for awhile?

15.  State the Law of Conservation of Energy

16.  How is energy related to speed?

17.  How is energy related to momentum?

18.  How is energy related to force?

19.  How is energy related to power?

20.  Apply the Law of Conservation of energy to work being done on a machine.

21.  Sound is produced by vibrations in a medium such as air. The particles are first pushed together and then pulled apart. Why is sound considered a form of mechanical energy?

22.  Water is boiled. The resulting steam is blown against huge turbine blades. The turning blades spin in a magnetic field, producing electricity. Describe in order the energy conservations.