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39 Cards in this Set

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  • 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
a number that has been determined by some measurement or estimation process
approximate number
the number of square units contained in a figure
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
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
the basic metric unit of length
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
an orderly procedure that aids in understanding and solving problems
problem-solving method
the basic unit of time
the international modern metric system of units of measurement
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
a measure of the gravitational force of pull acting on an object
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
a plane determined by the horizontal line called the x-axis and a vertical line called the y-axis intersecting at right angles. These two lines divide the humber plane into four quadrants. the x-axis contains positive numbers to the right of the origin and negative numbers to the left of the origin. The y-axis 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
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 x-axis to the vector
standard position
a physical quantity that requires both magnitude(size) and direction to be completely described
the horizontal component of a vector that lies along the x-axis
the vertical component of a vector that lies along the y-axis
change in velocity per unit time
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
a change in position
a propelled object that travels through the air but has no capacity to propel itself
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
the distance traveled per unit of time,a scalar because it is described by a number and a unit,not a direction
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