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