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39 Cards in this Set
 Front
 Back
The number of digits, called significant digits, in a measurement, which indicates the number of units that we are reasonably sure of having counted. The greater the number of significant digits, the better

accuracy


a number that has been determined by some measurement or estimation process

approximate number


the number of square units contained in a figure

area


an expression used to convert from one set of units to another. Often expressed as a fraction whose numerator and denominator are equal to each other although in different units

conversion factor


a number that has been determined as a result of counting, such as 21 students enrolled in a class, or by some definition such as 1h = 60 min.

exact number


the basic metric unit of mass

kilogram


the area of all the lateral (side) faces of a geometric solid

lateral surface area


a measure of the quantity of material making up an object

mass


the basic metric unit of length

metre


an instrument consisting of two platforms connected by a horizontal rod that balances on a knife edge. The pull of gravity on objects placed on the two platforms is compared

platform balance


refers to the smallest unit with which a measurement is made, that is, the position of the last significant digit

precision


an orderly procedure that aids in understanding and solving problems

problemsolving method


the basic unit of time

second


the international modern metric system of units of measurement

SI


the number of digits in a measurement, which indicates the number of units we are reasonably sure of having counted

significant digits


an instrument containing a spring, which stretches in proportion to the force applied to it, and a pointer attached to the spring with a calibrated scale read directly in given units

spring balance


a set of units of measurement for length, weight, and other quantities defined in such a way as to be useful to a large number of people

standards of measure


the total area of all the surfaces of a geometric solid; that is, the lateral surface area plus the area of the bases

total surface area


the number of cubic units contained in a figure

volume


a measure of the gravitational force of pull acting on an object

weight


when two or more vectors are added, each of the vectors is called a component of the resultant, or sum, vector

component vector


the net change in position of an object, or the direct distance and direction it moves; a vector

displacement


a plane determined by the horizontal line called the xaxis and a vertical line called the yaxis intersecting at right angles. These two lines divide the humber plane into four quadrants. the xaxis contains positive numbers to the right of the origin and negative numbers to the left of the origin. The yaxis contains positive numbers above the origin and negative numbers below the origin.

number plane


the sum of two or more vectors

resultant vector


a physical quantity that can be completely described by a number(called its magnitude) and a unit

scalar


a vector is in standard position when its initial point is at the origin of the number plane. The vector is expressed in terms of its length and its angle, where the angle is measured counterclockwise from the positive xaxis to the vector

standard position


a physical quantity that requires both magnitude(size) and direction to be completely described

vector


the horizontal component of a vector that lies along the xaxis

xcomponent


the vertical component of a vector that lies along the yaxis

ycomponent


change in velocity per unit time

acceleration


the acceleration of a freely falling object. On the earths surface the acceleration due to gravity is 9.80 m/s^2 (metric) or 32.2 ft/s^2 (U.S)

acceleration due to gravity


an acceleration that indicates an object is slowing down

deceleration


a change in position

motion


a propelled object that travels through the air but has no capacity to propel itself

projectile


the motionof a projectile as it travels through the air influencedonly by its original velocity and gravitational acceleration

projectile motion


the horizontal distance that a projectile will travel before striking the ground

range


the distance traveled per unit of time,a scalar because it is described by a number and a unit,not a direction

speed


the speed attained by a freely falling body when the air resistance equals its weight and no further acceleration occurs

terminal speed


the rate of motion in a particular direction.The time rate of change of an objects displacement. Velocity is a vector that gives the direction of travel and the distance traveled per unit of time

velocity
