32 terms

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

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?