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

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• ### 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?

Example: