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| SI units (abbreviated form of "Le Systeme International d'Unites") |
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| standard units of measurement |
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| the units for length, mass, & time |
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| Where did the name "base SI units" come from? |
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| these units are used along with various laws to define additional units for other important physical quantities (ex. force & energy) |
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| units for other physical quantities besides the base units; made from combinations of the base units |
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| Can quantities of different units be added & subtracted? |
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| The speed of an object must be specified as a _____ unit divided by a _____ unit |
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| the physical nature of a quantity & the type of unit used to specify it |
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| When using trigonometry, what must be done before labeling the sides of the triangle as "opposite" or "adjacent"? |
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| angle "theta" must be identified |
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| When would you use inverse trigonometric functions? |
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Definition
| when the values for two sides of the right triangle are available & the value of the angle "theta" is unknown |
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| What symbol is used to denote inverse trigonometric functions? |
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| an exponent of -1 next to sin, cos, or tan |
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| hypotenuse^2 = opposite^2 + adjacent^2 |
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| a quantity that can be described with a single number giving its size or magnitude |
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| 4 examples of scalar quantities |
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| volume, time, temperature, & mass |
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| a quantity that deals with both magnitude & direction |
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| What does the direction of the arrow when depicting a vector represent? |
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| the direction of the vector |
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| The length of a vector arrow is proportional to the _____ of the vector |
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| What is the fundamental distinction between scalars & vectors? |
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| vectors have direction, scalars do not |
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| the total vector after vector addition; denoted by a capital R with an arrow above |
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| When can vector addition be done in an identical fashion to addition of two scalar numbers (i.e. 2 + 3 = 5)? |
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Definition
| when the vectors point along the same direction |
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| What happens to a vector when it is multiplied by -1? |
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| the magnitude of the vector remains the same, but the direction of the vector is reversed |
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| positive or negative numbers (with units) that is positive if the vector points along the positive x or y axis and negative if it points along the negative x or y axis |
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| a vector that has a magnitude of 1, but no dimensions |
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| How is the unit vector denoted? |
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| when every vector component is individually 0 |
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| When are two vectors equal? |
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| if, and only if, they have the same magnitude & direction |
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