
vocab week 11vocab week 12
 physics:the science concerned with describing the interactions of energy, matter, space, and time; it is especially interested in what fundamental mechanisms underlie every phenomenon
 accuracy:the degree to which a measured value agrees with correct value for that measurement
 approximation: an estimated value based on prior experience and reasoning
 conversion factor:a ratio expressing how many of one unit are equal to another unit
 derived units:units that can be calculated using algebraic combinations of the fundamental units
 fundamental units:units that can only be expressed relative to the procedure used to measure them
 law:a description, using concise language or a mathematical formula, a generalized pattern in nature that is supported by scientific evidence and repeated experiments
 model:representation of something that is often too difficult (or impossible) to display directly
 precision:the degree to which repeated measurements agree with each other
 theory:an explanation for patterns in nature that is supported by scientific evidence and verified multiple times by various groups of researchers
vocab week 13
 acceleration:the rate of change in velocity; the change in velocity over time
 average acceleration:the change in velocity divided by the time over which it changes
 displacement:the change in position of an object
 distance:the magnitude of displacement between two positions
 distance traveled:the total length of the path traveled between two positions
 instantaneous acceleration:acceleration at a specific point in time
 instantaneous velocity:velocity at a specific instant, or the average velocity over an infinitesimal time interval
 kinematics:the study of motion without considering its causes
 slope:the difference in y value (the rise) divided by the difference in x value (the run) of two points on a straight line
 vector:a quantity that is described by both magnitude and direction
vocab week 14 acceleration due to gravity:acceleration of an object as a result of gravity
 deceleration:acceleration in the direction opposite to velocity; acceleration that results in a decrease in velocity
 elapsed time:the difference between the ending time and beginning time
 freefall:the state of movement that results from gravitational force only
 instantaneous speed:magnitude of the instantaneous velocity
 position:the location of an object at a particular time
 scalar:a quantity that is described by magnitude, but not direction
 time:change, or the interval over which change occurs
 motion:displacement of an object as a function of time
 relativity:the study of how different observers moving relative to each other measure the same phenomenon
vocab week 15 air resistance:a frictional force that slows the motion of objects as they travel through the air; when solving basic physics problems, air resistance is assumed to be zero
 analytical method:the method of determining the magnitude and direction of a resultant vector using the Pythagorean theorem and trigonometric identities
 classical relativity:the study of relative velocities in situations where speeds are less than about 1% of the speed of light—that is, less than 3000 km/s
 commutative:refers to the interchangeability of order in a function; vector addition is commutative because the order in which vectors are added together does not affect the final sum
 component (of a 2d vector):a piece of a vector that points in either the vertical or the horizontal direction; every 2d vector can be expressed as a sum of two vertical and horizontal vector components
 direction (of a vector):the orientation of a vector in space
 head (of a vector):the end point of a vector; the location of the tip of the vector's arrowhead; also referred to as the “tip”
 headtotail method:a method of adding vectors in which the tail of each vector is placed at the head of the previous vector
 magnitude (of a vector):the length or size of a vector; magnitude is a scalar quantity
 projectile:an object that travels through the air and experiences only acceleration due to gravity
vocab week 16