Work and energy

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Across
  1. 3. Near speed of light
  2. 6. Everything except the system
  3. 7. Unit of work and energy
  4. 8. The component of force along the displacement
Down
  1. 1. The energy principle states that change in energy is equal to work plus ____
  2. 2. Work being zero often means the force and displacement are ______
  3. 4. The thing we care about when solving energy problems
  4. 5. Special vector product we use to find work if given force and displacement as a vector
  5. 9. The energy of motion