Physics is Phun

12345678910111213141516171819202122232425262728293031323334353637383940
Across
  1. 2. When the angle of incidence is greater than the critical angle at the boundary between a medium with a greater refractive index and a medium with a smaller refractive index. Light is completely reflected back into the medium with the greater refractive index.
  2. 5. A factor that can affect the outcome of a scientific experiment, for example temperature.
  3. 7. The path followed by a projectile that is launched at an angle. When there is no air resistance, the path is parabolic.
  4. 15. A straight line that touches a curve at a point without crossing it.
  5. 16. A body’s state when the resultant force on it is zero.
  6. 18. A motion during which there is no change in the orientation of the moving object relative to a fixed point.
  7. 19. The effect a force has on rotating an object around a pivot.
  8. 21. The pull of gravity on a body, measured in newtons (N).
  9. 23. A volume of space which contains no molecules.
  10. 26. An estimate of where a quantity being measured falls between the nearest graduations or hatch marks on the equipment. The final digit is significant but uncertain.
  11. 27. A region of the electromagnetic spectrum. This light is emitted by the Sun but is mostly filtered out by our atmosphere.
  12. 28. The time it takes for a projectile to cover its maximum horizontal distance.
  13. 32. The top speed reached by any object experiencing air resistance or a similar resistance force.
  14. 34. Energy associated with molecular motion.
  15. 36. When a wave passes across a boundary between two different media and continues to travel through the new medium.
  16. 37. A quantity with a size (magnitude) and a direction.
  17. 38. The resistive force opposing the motion of a body inside a fluid.
  18. 39. The motion of a body in a circle with constant angular acceleration.
  19. 40. The process of heat moving from one area to another until both areas are balanced with the same amount of thermal radiation.
Down
  1. 1. The minimum frequency of light required to be incident on a metal in order to release electrons from the metal.
  2. 2. The force experienced by a rope (or wire, etc.) attached to a fixed point when the rope is pulled from the other end, or the force experienced by a rope when it is pulled from both ends.
  3. 3. The measure of the average kinetic energy of the particles in a substance
  4. 4. When an object is heated, its particles move further away from each other, and the volume of the object increases.
  5. 6. Where the duration of an event, as measured by an observer moving relative to the event, is found to be less than the proper time.
  6. 8. The voltage at the terminals of an electrical device (as a battery or a generator).
  7. 9. The minimum amount of energy required in order for an electron to be released from the atom.
  8. 10. The number of magnetic field lines passing through a unit area.
  9. 11. Velocity changes at a constant rate.
  10. 12. The distance between adjacent identical points on a wave, for example, two crests or two compressions.
  11. 13. A wave whose particles oscillate at right angles to the direction of energy transfer.
  12. 14. The degree of doubt or variability associated with a particular measurement. It may be due to instrument limitations, experimental conditions or human error.
  13. 17. The unit of measure of power.
  14. 20. The concept that light sometimes behaves as a wave and sometimes as a particle. Matter sometimes behaves as a particle and sometimes behaves as a wave.
  15. 22. The time taken to complete a full cycle.
  16. 24. A measure of the turning effect of a force. It is given by the product of the force’s magnitude and the perpendicular distance between the line of action of the force and the pivot. Torque is measured in newton metres (N m).
  17. 25. The core of a small dead star. It usually consists of leftover material that was not fused in the star, such as carbon.
  18. 29. A motion with constant velocity and no acceleration.
  19. 30. Any indication that a measuring system gives a false reading when the true value of a measured quantity is zero, e.g. the needle on an ammeter failing to return to zero when no current flows. A zero error may result in a systematic uncertainty.
  20. 31. The amount of energy transferred when an external force moves an object over a displacement. Work done is the product of the displacement of an object and the component of the force acting on the object that is parallel to the object’s displacement. It is measured in joules (J).
  21. 33. Speed in a specified direction. Velocity is a vector quantity.
  22. 35. A built-up area such as a town or city.