conservation of energy

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Across
  1. 2. the force that pulls objects toward each other
  2. 3. A force exerted toward the center of a curved path
  3. 8. the overall force on an object when all the individual forces acting on it are added together
  4. 13. A force that one object can apply to another without physically touching
  5. 14. equal forces acting on an object in opposite directions
  6. 15. the amount of matter in an object
  7. 16. The maximum speed an object will reach when free-falling through a substance, such as air
  8. 18. the force that one surface exerts on another when the two surfaces rub against each other
Down
  1. 1. forces that produce a nonzero net force, which changes an object's motion
  2. 4. The upward force that is applied to objects when they exert a force on a surface
  3. 5. When the net force of an object is zero
  4. 6. the motion of a falling object when the only force acting on it is gravity
  5. 7. A unit of measurement that equals the force required to accelerate 1 kilogram of mass at 1 meter per second, per second
  6. 9. a push or pull exerted on an object
  7. 10. A push or pull on one object by another that is touching it
  8. 11. The tendency of an object to resist any change in its motion
  9. 12. Friction acting upon an object moving through the air
  10. 17. the force of gravity on an object at the surface of the planet