Puzzle time

1234567
Across
  1. 2. something that never changes in any part of the universe
  2. 4. the path that a body follows as it travels around another body in space
  3. 5. the force of attraction or repulsion generated by moving or spinning electric charges
  4. 7. is where an object moves around another in a path/pattern
Down
  1. 1. the process of creating a current in a circuit by changing a magnetic field
  2. 3. the motion of a body when only the force of gravity is acting on the body.
  3. 5. a region where a magnetic force can be detected
  4. 6. a force of attraction between objects that is due to their mass