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### 40 Cards in this Set

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 Quantities in physics, such as mass, volume, and speed, which are fully described by magnitude alone scalar The horizonal axis on a graph on which the independent variable is plotted. x-axis A vector quantity which describes the rate at which an object changes its position. Also referred to as "speed with direction." velocity A scalar quantity which refers to "how much ground an object has covered" during its motion. distance The rate at which an object changes its velocity, meaning there is a change in speed, direction, or both. acceleration A point, assumed to be stationary, used to describe motion. frame of reference Refers to the duration of an action. time The vertical axis on a graph on which the dependent variable is plotted. y-axis A scalar quantity which refers to "how fast an object is moving." speed Refers to the way position changes relative to a starting point. May be indicated by the terms: north, south, positive, negative, up, or down. direction A vector quanity which refers to how far out of place an object is, or the object's change in position. displacement A quantity that has magnitude and direction. vector Refers to where an object is. position The degree of exactness with which an operation is performed or a measurement stated. precision Freedom from mistake or error; degree of conformity of a measure to a standard or a true value. accuracy The accepted measurement system of the scientific community, based on the meter, the kilogram, and the second. SI/metric Standar system of measurement used in daily activities in the United States. USCS The speed of an object at a specific moment. instantaneous speed The factor in an experiment that the researcher chooses to vary at specific intervals; is plotted on the x-axis. independent variable The total distance traveled divided by the total time of travel. average speed Refers to the degree of inclination or steepness of a line. slope The factor whose value changes a the result of a change in the independent variable and is plotted on the y-axis. dependent variable Refers to size and is expressed as a numerical value. magnitude Total displacement divided by the time interval. average velocity The velocity of an object at a specific moment. instantaneous velocity Type of motion that describes an object that is not accelerating. constant velocity A speed that does not change, such as a steady speed. constant speed Acceleration of an object a particular moment. instantaneous acceleration Type of motion that describes the steady change in velocity over time. constant velocity A simplified description of a physical system intended to capture the essential aspects of the system in a sufficiently simple form. model An assumption to be tested; a statement of a problem to be solved, expressed as a question. hypothesis A plausible or scientifically acceptable general principle or body of principles offered to explain phenomena. theory A specific measure of quantity (as of length, time, heat or value) used as a standard of measurement. unit An act of recognizing and noting a fact or occurrence; often involving measurement with instruments. observation An operation carried out under controlled conditions in order to discover an unknown effect or law, to test or establish a hypothesis, or to illustrate a known law. experiment A statement of an order or relation of phenomena that so far as is known is invariable under the given conditions. law Set up and established by authority as a rule for the measure of quanity, weight, extent, value or quality. standard Used to check, test or verify experiemnts; usually not itself manipulated during the experiment. control Something invariable or unchanging. constant A falling object which experiences no friction is in this type of motion and accelerates at a rate of 9.8 m/s2. freefall