Download - 8.1 The language of motion
![Page 1: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/1.jpg)
8.1 The language of motion
![Page 2: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/2.jpg)
8.1 LEARNING OUTCOMESVector quantities, such as displacement and
velocity, have both a magnitude and a direction.
An object in uniform motion will travel equal displacements in equal time intervals.
An object in uniform motion is represented as a straight line on a position-time graph.
![Page 3: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/3.jpg)
TERMS TO KNOW DisplacementDistancePositionPosition-time GraphScalarsSlope Uniform MotionVectorsVelocity
![Page 4: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/4.jpg)
8.1 THE LANGUAGE OF MOTION
Many words are used when describing motion.
Many of these words have specific meanings in science.
Some common words used to describe motion include:DistanceTime SpeedPosition
![Page 5: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/5.jpg)
Describe the motion of the soccer ball before and after it is kicked.What key words did you use when describing this situation?
8.1 THE LANGUAGE OF MOTION cont...
![Page 6: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/6.jpg)
DIRECTION MAKES A DIFFERENCE
Quantities that are measured or counted have a magnitude but may also contain a direction.Magnitude refers to the
size of a measurement or the amount you are counting. Every time you use a map
or give directions, you are using vectors.
![Page 7: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/7.jpg)
DIRECTION MAKES A DIFFERENCE cont…
Quantities that describe magnitude but do not include direction are called scalar quantities or scalars. Example: 25 seconds
Quantities that describe magnitude and also include direction are called vector quantities or vectors.Example: 5 km north
![Page 8: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/8.jpg)
DISTANCE AND POSITION
Distance (d) is a scalar quantity that describes thelength of a path between two points or locations.Example: A person ran a distance of 400 m.
Position ( ) is a vector quantity that describes a specific point relative to a reference point.Example: The school is 3.0 km east of my house.
d
![Page 9: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/9.jpg)
DISTANCE AND POSITION cont…The SI unit for both distance and position
is metres, m.
A car leaves home and drives 10 km to the store and then returns home. The car has driven a total distance of 20 km but its final displacement is 0 km.
![Page 10: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/10.jpg)
TIME INTERVAL AND POSITION
Time (t) is a concept that describes when an event occurs. Initial time (ti) is when the event began. Final time (tf) is when the event finished.
Time interval is the difference between the final and initial times.
![Page 11: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/11.jpg)
TIME INTERVAL AND POSITION cont…
Time interval is calculated by:if ttt
ssst 325
The time interval to move from the fire hydrant to the sign is calculated by:
The position of the sign is 7 m east of the tree.
![Page 12: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/12.jpg)
DISPLACEMENT AND DISTANCE
Displacement describes the straight-line distance and direction from one point to another.Displacement describes how much an
object’s position has changed.Displacement is equal to the final
position minus the initial position.
d =
d f -
d i
![Page 13: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/13.jpg)
DISPLACEMENT AND DISTANCE cont…
The SI unit for displacement is metres, m.
Between 2 s and 5 s the skateboarder’s displacement is 5 m [E]. The skateboarder’s distance travelled is 5 m.
d =
d f -
d i
![Page 14: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/14.jpg)
WATCH FOR SIGNS
When using vector quantities, opposite directions are given opposite signs.
![Page 15: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/15.jpg)
WATCH FOR SIGNS cont…
Common sign conventions
Between 0 s and 15 s the person’s displacement is
= 10 m [W] – 5 m [E]= -10 m – 5 m= -15 m= 15 m [W]
What distance did the person walk in this same time interval?
d =
d f -
d i
![Page 16: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/16.jpg)
UNIFORM MOTION
Objects in uniform motion travel equal displacements in equal time intervals.
Objects in uniform motion do not speed up, slow down, or change direction.
![Page 17: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/17.jpg)
UNIFORM MOTION cont…
The position of the ball in this photo is shown at equal time intervals. How would you determine if this motion is uniform motion?
![Page 18: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/18.jpg)
GRAPHING UNIFORM MOTION
Motion of an object can be analyzed by drawing a position-time graph.
A position-time graph plots position data on the vertical axis (y axis) and time data on the horizontal axis (x axis).
A straight line passing through the plotted data indicates uniform motion.
![Page 19: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/19.jpg)
GRAPHING UNIFORM MOTION cont…
A best-fit line is a smooth curve or straight line that most closely fits the general shape outlined by the points.
Uniform motion is represented by a straight line on a position-time graph.The straight line passes through
all the plotted points.
![Page 20: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/20.jpg)
SLOPE
The slope of a graph refers to whether a line is horizontal or goes up or down at an angle.
Positive slopeSlants up to the rightIndicates motion in the
direction of the positive y axis
![Page 21: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/21.jpg)
SLOPE cont…
Zero slopeHorizontal lineIndicates that the object is
stationary
Negative slopeSlants down to the rightIndicates motion in the direction of
the negative y axis
Take the Section 8.1 Quiz
![Page 22: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/22.jpg)
DistanceWhat does the word “distance” mean?
-write a short definition
-the length of a path between two points
Does “distance” give any indication of direction?
![Page 23: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/23.jpg)
DisplacementDescribes the straight-line distance and
direction from one point to another
When you run around a running track and return to where you startedyour distance is ….
400 mYour displacement is…
0 m
![Page 24: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/24.jpg)
Distance is a scalar quantity… has only magnitude (size or number)…no direction
Displacement is a vector quantity….has both magnitude and direction
![Page 25: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/25.jpg)
PracticeDetermine the distance traveled (from A to B) and the
displacement for each of the following.
A B 0 m 400 m
A B 400 m oval
A 400 m oval
B
![Page 26: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/26.jpg)
PositionPosition is a vector quantity that requires a
reference point
Describe the position using 2 different reference points.
Home Store
O km 2 km 10 km
EW
![Page 27: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/27.jpg)
In Physics a reference point is often given a position of “0”.
Objects to the right are “+”Objects to the left are “-”
-3m -2m -1m 0 1m 2m 3m
![Page 28: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/28.jpg)
d = “change in”d = df-di
final displacement – initial displacement
Determine the displacement of the car below.
-8km -6 -4 -2 0 2 4 6 8 10 12 14 km
![Page 29: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/29.jpg)
What is the displacement of the car?-18 km
What does the “-” mean?- can mean “to the left” or “West”
Describe the position of each car with respect to a reference point.
-8km -6 -4 -2 0 2 4 6 8 10 12 14 km
![Page 30: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/30.jpg)
tt = tf-ti
This formula can allow us to find a time interval for a traveling object.
0 s 2s 4s 6s 8s 10s 12s 14s 16s 18s 20s 22s
How long did it take the motorcycle to travel ….. from the stop sign to the tree?..... from the tree to the house?
![Page 31: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/31.jpg)
8.2 Average Velocity
Speed vs.
Velocity
(c) McGraw Hill Ryerson 2007
![Page 32: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/32.jpg)
(c) McGraw Hill Ryerson 2007
8.2 Average VelocitySpeed ( )
distance / time interval.scalarmetres per second (m/s).
Velocity ( )displacement /time interval.Vector; must include direction.
direction of the velocity is the same as the direction of the displacement.
metres per second (m/s). See pages 26 - 27
These two ski gondolas have the same speed but have different velocities since they are travelling in opposite directions.
v
v
v
![Page 33: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/33.jpg)
(c) McGraw Hill Ryerson 2007
Calculating the Slope of the Position-Time GraphThe slope of a graph is
represented by rise/run.On a position-time graph the
slope is the change in position ( ) divided by the change in time ( ).
The steeper the slope the greater velocity.
See pages 28 - 29
t
Which jogger’s motion has a greater slope?Which jogger is moving faster?
slope
d
t
d
![Page 34: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/34.jpg)
(c) McGraw Hill Ryerson 2007
Average VelocityThe slope of a position-time graph is the object’s average velocity.
The symbol of average velocity is:
See pages 28 - 29
v av
![Page 35: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/35.jpg)
(c) McGraw Hill Ryerson 2007
Calculating Average VelocityThe relationship between average velocity,
displacement, and time is given by:
Use the above equation to answer the following:1. What is the average velocity of a dog that
takes 4.0 s to run forward 14 m?
2. A boat travels 280 m East in a time of 120 s. What is the boat’s average velocity?
See pages 31 - 32Answers on the next slide.
v av
d
t
![Page 36: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/36.jpg)
(c) McGraw Hill Ryerson 2007
Calculating Average VelocityThe relationship between average velocity,
displacement, and time is given by:
Use the above equation to answer the following:1. What is the average velocity of a dog that
takes 4.0 s to run forward 14 m? (3.5 m/s forward)
2. A boat travels 280 m East in a time of 120 s. What is the boat’s average velocity? (2.3 m/s East)
See pages 31 - 32
v av
d
t
![Page 37: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/37.jpg)
Calculating DisplacementThe relationship between displacement, average
velocity, and time is given by:
Use the above equation to answer the following:1. What is the displacement of a bicycle that
travels 8.0 m/s [N] for 15 s?
2. A person, originally at the starting line, runs west at 6.5 m/s. What is the runner’s displacement after 12 s? See page 32Answers on the next slide.
d v av t
![Page 38: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/38.jpg)
(c) McGraw Hill Ryerson 2007
Calculating DisplacementThe relationship between displacement, average
velocity, and time is given by:
Use the above equation to answer the following:1. What is the displacement of a bicycle that
travels 8.0 m/s [N] for 15 s? (120 m [N])
2. A person, originally at the starting line, runs west at 6.5 m/s. What is the runner’s displacement after 12 s? (78 m west)
See page 32
d v av t
![Page 39: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/39.jpg)
Calculating TimeThe relationship between time, average velocity, and
displacement is given by:
Use the above equation to answer the following:1. How long would it take a cat walking north at 0.80
m/s to travel 12 m north?
2. A car is driving forward at 15 m/s. How long would it take this car to pass through an intersection that is 11 m long?
See page 33Answers on the next slide.
t d
v av
![Page 40: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/40.jpg)
Calculating TimeThe relationship between time, average velocity, and
displacement is given by:
Use the above equation to answer the following:1. How long would it take a cat walking north at 0.80
m/s to travel 12 m north? (15 s)
2. A car is driving forward at 15 m/s. How long would it take this car to pass through an intersection that is 11 m long? (0.73 s)
See page 33
t d
v av
![Page 41: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/41.jpg)
(c) McGraw Hill Ryerson 2007
Converting between m/s and km/h To convert from km/h to m/s
Change km to m: 1 km = 1000 m Change h to s: 1 h = 3600 s
Therefore multiply by 1000 and divide by 3600or
Divide the speed in km/h by 3.6 to obtain the speed in m/s.
For example, convert 75 km/h to m/s.
See page 33
sms
hkm
mhkm /21
36001
11000
175
Speed zone limits are stated in kilometres per hour (km/h).
![Page 42: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/42.jpg)
(c) McGraw Hill Ryerson 2007
Converting between m/s and km/h
Try the following unit conversion problems yourself.
1. Convert 95 km/h to m/s.
2. A truck’s displacement is 45 km north after driving for 1.3 hours. What was the truck’s average velocity in km/h and m/s?
3. What is the displacement of an airplane flying 480 km/h [E] during a 5.0 min time interval?
See page 34
See next slide for answers
![Page 43: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/43.jpg)
(c) McGraw Hill Ryerson 2007
Converting between m/s and km/h
Try the following unit conversion problems yourself.
1. Convert 95 km/h to m/s. (26 m/s)
2. A truck’s displacement is 45 km north after driving for 1.3 hours. What was the truck’s average velocity in km/h and m/s? (35 km/h [N], 9.6 m/s [N])
3. What is the displacement of an airplane flying 480 km/h [E] during a 5.0 min time interval?(40 km [E] or 40, 000 m [E])
See page 34Take the Section 8.2 Quiz
![Page 44: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/44.jpg)
Position-Time and Velocity-Time Graphs
![Page 45: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/45.jpg)
Questions for ConsiderationWhat is a position-time graph?What is a velocity-time graph?How do features on one graph translate into
features on the other?
![Page 46: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/46.jpg)
Position-Time GraphsShow an object’s position as a function
of time.x-axis: timey-axis: position
![Page 47: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/47.jpg)
Position-Time Graphs Imagine a ball rolling along a table, illuminated by a
strobe light every second.
You can plot the ball’s position as a function of time.
0 s
1 s
2 s
3 s
4 s
5 s
6 s
7 s
8 s
9 s
10 s
![Page 48: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/48.jpg)
Position-Time Graphs
1 2 3 4 5 6 7 8 9 10
12345678910
time (s)
posi
tion
(cm
)
![Page 49: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/49.jpg)
Position-Time GraphsWhat are the
characteristics of this graph?Straight line, upward
slopeWhat kind of motion
created this graph?Constant speed 1 2 3 4 5 6 7 8 9 1
0
1
2
3
4
5
6
7
8
9
10
time (s)
posi
tion
(cm
)
![Page 50: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/50.jpg)
Position-Time GraphsEach type of motion has a characteristic
shape on a P-T graph.Constant speedZero speed (at rest)Accelerating (speeding up)Decelerating (slowing down)
![Page 51: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/51.jpg)
Position-Time GraphsConstant speed is represented by a straight
segment on the P-T graph.
time (s)po
s.
(m)
Constant speed in positive direction.
time (s)po
s.
(m)
Constant speed in negative direction.
![Page 52: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/52.jpg)
Position-Time GraphsConstant speed is represented by a straight
segment on the P-T graph.
time (s)po
s.
(m)
A horizontal segment means the object is at rest.
![Page 53: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/53.jpg)
Position-Time GraphsCurved segments on the P-T graph mean
the object’s speed is changing.
time (s)po
s.
(m)
Speeding up in positive direction.
time (s)po
s.
(m)
Speeding up in negative direction.
![Page 54: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/54.jpg)
Position-Time GraphsCurved segments on the P-T graph mean the
object’s speed is changing.
time (s)po
s.
(m)
Traveling in positive direction, but slowing down.
time (s)po
s.
(m)
Traveling in negative direction, but slowing down.
![Page 55: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/55.jpg)
Position-Time GraphsThe slope of a P-T graph is equal to the
object’s velocity in that segment.
time (s)
posi
tion
(m)
10 20 30 40
10
20
30
40
50 slope = change in ychange in x
slope = (30 m – 10 m)(30 s – 0 s)
slope = (20 m)(30 s)
slope = 0.67 m/s
![Page 56: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/56.jpg)
Position-Time GraphsThe following P-T graph corresponds to an
object moving back and forth along a straight path. Can you describe its movement based on the graph?
time (s)
posi
tion
(m)
N
S
![Page 57: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/57.jpg)
Velocity-Time GraphsA velocity-time (V-T) graph shows an
object’s velocity as a function of time.A horizontal line = constant velocity.A straight sloped line = constant
acceleration.Acceleration = change in velocity over time.
Positive slope = positive acceleration.Not necessarily speeding up!
Negative slope = negative acceleration.Not necessarily slowing down!
![Page 58: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/58.jpg)
Velocity-Time GraphsA horizontal line on the V-T graph means
constant velocity.
time (s)ve
loci
ty
(m/s
)
N
S
Object is moving at a constant velocity North.
![Page 59: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/59.jpg)
Velocity-Time GraphsA horizontal line on the V-T graph means
constant velocity.
time (s)ve
loci
ty
(m/s
)
N
S
Object is moving at a constant velocity South.
![Page 60: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/60.jpg)
Velocity-Time GraphsIf an object isn’t moving, its velocity is zero.
time (s)ve
loci
ty
(m/s
)
N
S
Object is at rest
![Page 61: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/61.jpg)
Velocity-Time GraphsIf the V-T line has a positive slope, the object
is undergoing acceleration in positive direction.If v is positive also, object is speeding up.If v is negative, object is slowing down.
![Page 62: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/62.jpg)
Velocity-Time GraphsV-T graph has positive slope.
time (s)ve
loci
ty
(m/s
)
N
S Positive velocity and positive acceleration: object is speeding up!
time (s)ve
loci
ty
(m/s
)
N
S Negative velocity and positive acceleration: object is slowing down.
![Page 63: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/63.jpg)
Velocity-Time GraphsIf the V-T line has a negative slope, the object
is undergoing acceleration in the negative direction.If v is positive, the object is slowing down.If v is negative also, the object is speeding up.
![Page 64: 8.1 The language of motion](https://reader036.vdocuments.site/reader036/viewer/2022062310/56816216550346895dd2438d/html5/thumbnails/64.jpg)
Velocity-Time GraphsV-T graph has negative slope.
time (s)ve
loci
ty
(m/s
)
N
S Positive velocity and negative acceleration: object is slowing down,
time (s)ve
loci
ty
(m/s
)
N
S Negative velocity and negative acceleration: object is speeding up! (in negative direction)