# Shared Flashcard Set

## Details

Chapter 1
Introduction & Mathematical Concepts
31
Physics
01/06/2015

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