Unit 6 Work, Energy, and Momentum Key Terms

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Across
  1. 4. States that in a closed, isolated system, energy is not created or destroyed, but rather, is conserved.
  2. 5. Kinetic energy of a system due to its rotational motion, proportional to the system's moment of inertia and the square of its angular velocity.
  3. 6. A device that makes work easier (but does not change the amount of work) by changing the magnitude or the direction of the force exerted to do work.
  4. 7. The product of a rotating object's moment of inertia and its angular velocity; measured in kg m^2/s
  5. 11. The energy of a system that is associated with its motion.
  6. 12. A type of collision in which the kinetic energy after the collision is less than the kinetic energy before the collision.
  7. 13. The rate at which energy is transformed.
  8. 17. For an ideal machine, is equal to the displacement of the effort force divided by displacement of the resistance force.
  9. 19. Stored energy due to the interactions between objects in a system.
  10. 20. The stored energy in a system resulting from the gravitational force between objects; represented by the symbol GPE.
  11. 21. States that the impulse on an object equals the object's final momentum minus the object's initial momentum.
  12. 24. The sum of kinetic energy and potential energy of the objects in a system.
  13. 27. States that the momentum of any closed, isolated system does not change.
  14. 29. The product of the average net force on an object and the time interval over which the force acts.
  15. 30. The ratio of resistance force to effort force
  16. 31. A machine consisting of two or more simple machines that are connected so that the resistance force of one machine becomes the effort force of the second machine.
  17. 32. Stored energy due to an object's change in shape.
Down
  1. 1. A type of collision in which the kinetic energy before and after the collision remains the same.
  2. 2. States that when work is done on a system, a change in energy occurs.
  3. 3. States that the angular impulse on an object is equal to the change in the object's angular momentum.
  4. 8. The energy of a system due to the system's change in position.
  5. 9. States that if there are no net external torques on a closed system, then its angular momentum is conserved.
  6. 10. The force exerted by a machine.
  7. 12. A closed system on which the net external force is zero.
  8. 14. The ability of a system to produce a change in itself or in the world around it; represented by the symbol E.
  9. 15. Unit of power; 1 J of energy transferred in 1 s.
  10. 16. A system that does not gain or lose mass.
  11. 18. The force a user exerts on a machine.
  12. 22. The ratio of output work to input work.
  13. 23. The position where gravitational potential energy is defined as zero.
  14. 25. The product of the object's mass and the object's velocity; measure in kg m/s.
  15. 26. the transfer of energy that occurs when a force is applied through a distance; equal to the product of the system's displacement and the force applied to the system in the direction of displacement.
  16. 28. The sum of the kinetic energies and potential energies of the particles in a system.