32 terms

Abeka Physics Chapter 6

This set covers Abeka Physics Chapter 6: "Introduction to Motion" (pages 80-93).
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Terms in this set (...)

kinematics
the study of motion without regard to force
translational motion
term for any change in position
rectilinear motion
term for translational motion along a straight line
curvilinear motion
term for translational motion along a curved line
speed
term meaning the distance an object moves per unit of time
velocity
term for speed in a single stated direction
vector
term for any quantity having both a magnitude and a direction
scalar
term for any quantity that has a magnitude but no direction
constant velocity (uniform motion)
term for rectilinear motion with no change in speed
variable velocity
term for motion involving starts, stops, and maneuvers
average speed
When an object has variable motion, it is convenient to describe its rate of progress along its actual path in terms of ____ ____.
displacement
term for the distance between two points in a straight line
average velocity
the way we describe the straight-line motion of an object that does not actually travel a single direction with constant speed
sign convention
a way of showing positive and negative direction
point of reference
term for the point that all motion is compared to
instantaneous velocity
term for the velocity at any given moment in time
trend line
term for the line drawn through the average positions of the various data points on a graph
slope
Velocity is equal the ___ of the trend line on a graph.
acceleration
term for any change in velocity per unit time
average acceleration
term for a change in velocity divided by the time required for the change
uniformly accelerated
When the acceleration of an object is constant from one time interval to the next, its motion is _____ ______.
variably accelerated
When the acceleration of an object is not uniform from one time interval to the next, its motion is ____ ______.
instantaneous acceleration
The slope of the tangent to the curve at a given point on the velocity vs. time graph represents _______ _______.
deceleration
term for negative acceleration
gravity and air resistance
two forces that act on a falling object
free fall
If an object falling toward the earth has no forces acting on it except gravity (ignoring air resistance), that object is in ___ ____.
9.80 m/s^2 (32.2 ft/s^2)
the value of gravity
altitude
factor that affects the value of gravity
False
True or False: The value of gravity is greater at a higher altitude.
surface area, mass
An object with a large ____ ___ in relation to its ___ experiences more air resistance.
terminal velocity
term for the fastest velocity at which an object can fall
when the force of air resistance equals the weight of the object
When does a falling object reach its terminal velocity?