Engineering

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Across
  1. 1. / The force that pulls objects toward Earth (7)
  2. 3. / Material used to make wires (6)
  3. 7. / Machines that help lift or move heavy objects (6)
  4. 11. / Tool used to drive nails (6)
  5. 12. / Material that conducts electricity (5)
  6. 15. / Fastening device, often metal, used to hold pieces together (4)
  7. 17. / Shape with three sides (8)
  8. 18. / Instrument for measuring length (5)
  9. 20. / Device that converts energy into motion (5)
Down
  1. 2. / Device used to measure temperature (11)
  2. 4. / Liquid used for cutting or lubricating machines (3)
  3. 5. / Machine part that rotates to transmit motion (5)
  4. 6. / Safety item worn on the head (6)
  5. 8. / Type of bridge that has cables (5)
  6. 9. / A gas used to inflate balloons or used in welding (5)
  7. 10. / A drawing that shows the design of something (10)
  8. 13. / A structure that spans gaps, e.g., over rivers (6)
  9. 14. / Type of energy stored in moving objects (7)
  10. 16. / Energy that comes from the Sun (5)
  11. 19. / Protective clothing for eyes (7)