Unit 1 Physical Science

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Across
  1. 2. Light light waves in which the vibrations are confined to a single plane
  2. 7. wheel with a grooved rim over which a rope or cable can run
  3. 8. Advantage ratio of the output force exerted by a machine to the input force applied to the machine
  4. 10. fixed point around which a lever pivots
  5. 11. force applied to a machine to make it do work
  6. 13. force that opposes the movement of an object
  7. 15. force that opposes the relative motion of two objects in contact
Down
  1. 1. transfer of energy that occurs when a force causes an object to move in the direction of the force
  2. 3. ability of a surface to reflect light
  3. 4. Smoothness property of a surface that describes how flat and even it is
  4. 5. Error difference between a measured value and the accepted value, expressed as a percentage of the accepted value
  5. 6. bright light that causes discomfort or difficulty seeing
  6. 9. ratio of the useful output of a machine to the total energy put into it
  7. 12. rigid bar that rests on a fulcrum and is used to pry or lift objects
  8. 14. Plane flat surface that is tilted at an angle