14 & 15

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Across
  1. 1. energy - thermal energy beneath Earth’s surface. Biomass energy - the chemical energy stored in living things
  2. 4. - a V-shaped object whose sides are two inclined planes sloped toward each other
  3. 6. - a rigid bar that is free to move around a fixed point
  4. 9. - a simple machine that consists of a rope that fits into a groove in a wheel
  5. 11. energy - energy that travels in waves
  6. 13. energy - the energy stored in atomic nuclei
  7. 15. energy - energy dealing with temperature
  8. 17. - the rate of doing work
  9. 20. potential energy - potential energy that depends upon an object’s height above a reference point
  10. 21. conversion - the process of changing energy from one form to another
  11. 24. energy - the energy stored in chemical bonds
  12. 25. plane - a slanted surface along which a force moves an object to a different elevation
  13. 26. energy resource - a source of energy that can be replaced in a relatively short period of time
Down
  1. 2. - a device that changes a force & helps you do work
  2. 3. energy - energy obtained from flowing water
  3. 4. and axle - a simple machine that consists of two rigidly attached disks or cylinders, each one with a different radius
  4. 5. energy - the energy associated with the motion and position of everyday objects
  5. 7. energy - the energy associated with electric charges
  6. 8. conservation - the practice of finding ways to use less energy or to use energy more efficiently
  7. 10. - the product of distance and the force in the direction an object moves
  8. 12. potential energy - the potential energy of an object that is stretched or compressed
  9. 14. - the ability to do work
  10. 16. energy resource - a source of energy that exists in limited quantities and, once used, cannot be replaced except over the course of millions of years
  11. 17. energy - energy that is stored as a result of position or shape
  12. 18. energy - the energy an object has due to its motion
  13. 19. fuels - rich deposits of hydrocarbon mixtures that formed from the remains of organisms
  14. 22. energy - sunlight that is converted into usable energy
  15. 23. - an inclined plane wrapped around a cylinder