Newton's First Law

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Across
  1. 1. The quantity of matter in an object.
  2. 5. In circular motion an object changes velocity because the ............ changes.
  3. 7. The fastest constant speed an object can reach when it is falling towards Earth.
  4. 12. An object is travelling at 20 m/s. The forward force acting on it is 10 N and the backwards force acting on it is 10 N. What will happen to the speed of the object?
Down
  1. 2. A quantity which has only size.
  2. 3. A measure of the pull of gravity on an object.
  3. 4. The resultant force that causes circular motion.
  4. 6. If the forces are ........... an object will start to accelerate.
  5. 7. The value of gravitational field strength on Earth.
  6. 8. The sum of all the forces acting on an object.
  7. 9. As an object falls the drag acting on it ................ .
  8. 10. If the forces are ............ an object will not change velocity.
  9. 11. A quantity which has both size and direction.