physics of IGCSE 3

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Across
  1. 4. - Propulsive force (e.g., rocket engines).
  2. 9. - Distance between wave crests.
  3. 12. - Force per unit area.
  4. 13. - Rapid back-and-forth motion.
  5. 14. - Space devoid of matter/air.
  6. 17. - Possibility of harm or loss.
  7. 18. (force) - Turning effect of a force (torque).
  8. 20. - Perpendicular (90°) to a surface.
  9. 21. - Central core of an atom (protons + neutrons).
  10. 22. - (Wave) bounced back from a surface.
Down
  1. 1. force - Single force combining all acting forces.
  2. 2. - Fixed rotation point (fulcrum).
  3. 3. - Stretching force in materials like ropes.
  4. 5. - Bending of waves when entering new medium.
  5. 6. - Push away (opposite of attract).
  6. 7. - Consistency in repeated measurements.
  7. 8. - Energy transfer through oscillations.
  8. 9. - Gravitational force on an object.
  9. 10. - Neutral subatomic particle in atomic nucleus.
  10. 11. field - Region where magnetic forces act.
  11. 15. - Substance waves travel through (e.g., air, water).
  12. 16. - Amount of 3D space occupied.
  13. 19. - Positively charged subatomic particle in nucleus.