Science Chapter 1

A(n) _____ line on a distance-time graph indicates that the motion has stopped

horizontal

When an object changes direction, the acceleration arrows point to the ____ of the curve along which the object is moving

inside

_________ _____ is speed at a specific instant in time.

instantaneous speed

If SI units are used in the acceleration equation, then acceleration has units of ____ ____ _____ ____

meters per second squared

Distance-time graphs can be used to compare the ____ of two different objects

motion

_____ is the process of changing position. It is always described relative to a(n ______ _____

motion reference point

If acceleration is negative, then it is ____ the direction of motion

opposite

When the velocity of an object is decreasing, the acceleration arrow points in the ____ direction as the velocity arrows.

opposite

To find a position in two dimensions, first choose a reference ___. Next specify reference ____. Then determine the ____ along each reference direction

point directions distance

A(n) ___ is an object's distance and direction from a reference point.

position

Changing a reference point does NOT change the actual ____ of an object

position

If a reference point changes, the description of an object's ___ will also change

position

_____ can be described by one's direction and distance from a reference point

position

A reference direction can be described as a(n) ____ direction. The opposite direction is the ____ direction

positive negative

Examples of _____ directions in two dimensions include "north and east" and "right and forward."

reference

A(n) _______ _____ is a starting point you choose to describe the location, or position, of an object

reference point

The speed-time graph for an object at ____ is a horizontal line at y = 0.

rest

what is the equation for finding speed

s= d/t

When the velocity of an object is increasing, the acceleration arrow points in the ____ direction as the velocity arrows.

same

When the slope of a line on a distance-time graph decreases, it means that the speed of the object is ____ ____

slowed down

If an object is _____ _____, its speed-time graph is a line that slants downward toward the right side of the graph

slowing down

____ is a measure of the distance an object travels per unit of time.

speed

Velocity changes when the ___ of an object changes, when the ____ in which the object is moving changes, or when the speed and the ___ change.

speed direction direction

The equation for average speed is v = d/ t , where the symbol v stands for average ___, d stands for total ___, and t stands for total ____

speed distance time

A(n) ____-____ graphs can be used to show how speed changes over time.

speed-time

When the slope of a line on a distance-time graph increases, it means that the speed of the object is _____ __

speeding up

The speed-time graph for an object that is ______ ___ is a line that slants upward toward the ___ side of the graph.

speeding up right

____ lines on distance-time graphs indicate faster speeds.

steeper

Constant speed is shown as a(n) ____ line on a distance-time graph

straight

what is the equation for finding time

t= d/s

A speed-time graph has ___ plotted on the horizontal axis, which is the x-axis. ___ is plotted on the vertical axis, which is the y-axis

time speed

what is the equation for average speed

v= d/t

what is the equation for acceleration

v= initial speed- final speed/ total time

An acceleration arrow's direction depends on whether the ____ increases or decreases

velocity

Speed and direction describe one's _____

velocity

____ is the speed and the direction of a moving object

velocity

An object accelerates when its ____ changes as a result of increasing speed, decreasing speed, or a change of ____

velocity direction

___ ____ is the rate of change of position in which the same distance is traveled each second

constant speed

what is the equation for finding distance

d= s(t)

When you describe position using two directions, you are using two ____

dimensions

Distance and displacement are equal only if the motion is in one ____

direction

Speed-time graphs do not show what happens when velocity changes as the result of a change of ____

direction

When you describe an object's position, you compare its location to a reference _____

direction

______ is the difference between the initial position and the final position of an object.

displacement

___ is the length of the path an object moves along.

distance

A complete description of a position includes a ____, a(n) ____, and a ____ point

distance direction reference

Units of speed are units of ____ divided by units of time. The SI unit for speed is ___ per second.

distance meters

Graphs that compare distance and time are called _____-____ graphs

distance-time

how do you calculate speed using a distance time graph

final distance- initial distance / final time- initial time

Even when the speed of an object isn't _____, its average speed can be calculated from a distance-time graph.

changing

If an object is moving at ____ speed, its speed-time graph is a horizontal line above the x-axis.

constant

If one's velocity is changing, that person is ______

accelerating

_____ is a measure of the change in velocity during a period of time.

acceleration

Like velocity, acceleration has a direction and can be represented by a(n) _____

arrow

The velocity of an object can be represented by a(n) ___. The length of the arrow indicates the ___. The arrow points in the direction of the object's ____

arrow speed motion

Distance and displacement can be compared to find one's _____ ____

average speed

______ ____ is the total distance traveled divided by the total time it took to go that distance

average speed

Distance-time graphs can be used to calculate the _____ _____ of an object. The difference in ___ between two points is divided by the difference in ___ between the same points.

average speed distance time