Unit 4 - Energy

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Across
  1. 2. A force that opposes motion between two surfaces that are touching.
  2. 4. A natural resource that can be converted by humans into other forms of energy in order to do useful work.
  3. 5. The energy of motion.
  4. 7. The total energy of motion and position of an object.
Down
  1. 1. The energy of position or shape.
  2. 3. Nonrenewable energy resources that form in the Earth's crust over millions of years.
  3. 6. The ability to do work.