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Yr 10 Physics Ch 8.1
| Term | Definition |
|---|---|
| Distance | a measurement of the total path that an object travels – includes twists and turns – does not include a specified direction. |
| Displacement | a straight line measurement of the distance separating and object from where it started to where it finished – includes a specified direction. |
| Scalar quantity | a quantity such as distance or time that has size but not a direction. |
| Vector quantity | a quantity, such as displacement or velocity that has both size and direction. |
| Reaction time | the length of time it takes a driver to respond to a hazard/emergency |
| Reaction distance | the distance moved while reacting to a hazard/emergency |
| Speed | the rate of change of distance (scalar) |
| Velocity | the rate of change of displacement (vector) |
| Instantaneous speed | the speed of an object at a particular time. |
| Error | the difference between the value that is measured and the actual measurement. |
| Precision | how close the measure values are to each other. |
| Random error | error that changes unpredictably. |
| Systematic error | error that always differs by the same amount. |