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Conceptual Physics
Introduction to Physics & Chapter 4
Term | Definition |
---|---|
Units | A quantity that is ‘standard’ (known and used by many) for a particular measurement. |
Fundamental Units | They can not be expressed in term of other units. |
Prefixes | They are simply a number, specifically they are “powers of ten” and are expressed as letter symbols. |
Error | It refers to the difference between a measured value and the true value. |
% Error | |True value – Measured value| x 100 Accepted value (true value) |
Accuracy | It shows how close the answer is to the true value (accepted value). |
Uncertainty | It shows how limited your measuring device is. |
% Uncertainty | Uncertainty x 100 Measurement |
Precision | It shows how finite, or close, the measurement is. |
Significant Figures | They are the numbers in any measurement that we know with certainty, plus one digit that is uncertain. |
Scientific Notation | a method for expressing a given quantity as a number having significant digits necessary for a specified degree of accuracy, multiplied by 10 to the appropriate power. |
Relative | An object is moving is if its position is relative to a fixed point that is changing. |
Speed | It is a measure of how fast something is moving in a certain amount of time. |
Instantaneous Speed | The speed at any instant. |
Average Speed | The total distance covered divided by the time interval. |
Velocity | Speed in a given direction. |
Acceleration | The rate at which velocity changes. Fomula: change of velocity divided by the time interval. |
Free Fall | When there is no air resistance, and gravity is the only thing affecting a falling object. |
Elapsed Time | It is time that has passed since the beginning of any motion. |
Scalar Quantity | It has no direction associated with it. (Speed is one) |
Vector Quantity | It specifies both magnitude (size) and direction. (Acceleration is one) |