Physics Extra Credit Crossword

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Across
  1. 2. The nucleus of a helium atom (two protons and two neutrons) emitted as radiation from a decaying heavy nucleus
  2. 8. Atoms of an element with identical chemical properties but with different masses; are atoms of the same element with different numbers of neutrons
  3. 9. The time required for one-half of the unstable nuclei in a radioactive substance to decay into a new element
  4. 11. the rate at which velocity changes over time; an object only ______ if its speed, direction, or both change
  5. 13. A phase of matter; a very hot gas consisting of electrons and atoms that have been stripped of their electrons because of high kinetic energies
  6. 14. Force x Displacement in the direction of the force
  7. 15. The force required to pull an object out of its natural straight-line path and into a circular path
  8. 17. force of air on objects moving through it.
  9. 18. carrier of strong nuclear force
  10. 19. the tendency of an object to resist beign moved or, if the object is moving, to resist a change in speed or direction
  11. 20. Unit of potential difference equivalent to joules/coulomb
Down
  1. 1. Nuclear reaction of low mass nuclei fusing together to form more stable and more massive nuclei with an accompanying release of energy
  2. 2. Unit of electric current. It is equivalent to coulomb/sec.
  3. 3. An apparent outward force on an object following a circular path that. This force is a consequence of the third law of motion
  4. 4. Nuclear reaction of splitting a massive nucleus into more stable, less massive nuclei with an accompanying release of energy
  5. 5. A cylindrical coil of wire that becomes electromagnetic when a current runs through it
  6. 6. in physics, the state in which the net force on an object is zero
  7. 7. The theoretical remaining core of a supernova that is so dense that even light cannot escape
  8. 10. the change in position of an object
  9. 12. action exerted on an object which may change the object's state of rest or motion; also has magnitude and direction
  10. 16. Spontaneous emission of particles or energy from an atomic nucleus as it disintegrates