1. 3. point A place used for comparison to determine if something is in motion
  2. 4. an object in motion stays in motion
  3. 7. the distance an object travels per unit of time
  4. 8. the state in which one objects distance from another is changing
  5. 9. a measure of the compactness of a substance, expressed as its mass per unit volume
  6. 12. second law the acceleration of an object depends on the mass of the object and the amount of force applied
  7. 14. a speed in any direction
  8. 16. a flow of electric charge through a conductor
  9. 17. velocity the maximum speed possible while free falling
  10. 18. force forces that produce a nonzero net force
  11. 20. produced by reactions involving atomic or molecular changes
  12. 22. the entity as a source of nuclear energy
  13. 24. the amount of energy transferred or converted
  14. 26. fall when the only force acted on an object is gravity
  15. 27. the capacity of a physical system to do work
  16. 28. friction friction which keeps things still
  17. 30. mechanical vibrations transmitted by an elastic medium
  18. 32. energy the mechanical energy that a body has by virtue of its motion
  19. 34. the rate in which the velocity changes
  20. 35. energy the mechanical energy that a body has by virtue its position
  21. 38. a deviation in the direction of a wave at the edge of an obstacle in its path
  22. 39. constituting the core or central part
  1. 1. the force that pulls objects towards each other
  2. 2. any device for converting mechanical energy into electrical energy by electromagnetic induction
  3. 5. force equal force acting on an object in different directions
  4. 6. the number of times that a periodic function or vibration repeats itself in a specified time. Usually measured in hertz
  5. 10. a linear interval of space
  6. 11. push or pull on an object
  7. 13. force the overall force on an object
  8. 15. a stable elementary particle present in all atoms, orbiting the nucleus in numbers equal to the atomic number of the element in a neutral atom
  9. 16. a substance, body, or system that conducts electricity, heat, etc.
  10. 19. quantity of matter
  11. 21. of conservation of energy the law that states that energy cannot be created nor destroyed but can be changed from one form to another
  12. 23. the process by which masses of relatively warm air are raised into the atmosphere, often cooling and forming clouds, which compensatory downward movements of cooler air
  13. 25. third law for every action there is an equal opposite reaction
  14. 26. the force between two rubbing surfaces
  15. 29. the frequency of a periodic phenomenon that has a periodic time of 1 second
  16. 31. plains a flat surface which has a slope
  17. 33. the product of a body's mass and velocity
  18. 36. the part of the electromagnetic spectrum with a longer wavelength than light but a shorter wavelength than radio waves
  19. 37. the random thermal motion of atoms, molecules, clusters of atoms, et, in gases, liquids, and some solids