1. Chapter 11: Motion Section 1 Part 2- Graphs of Speed
Physical Science
Chapter 11: Motion
Section 1
Part 2- Graphs of Speed

2. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ●Distance plotted on the y axis ●Time the x axis.

3. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ●Distance vs. Time graphs with different speeds

4. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Distance vs. Time graphs with different velocities

5. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Calculating speeds from Distance vs. Time graphs ● You need to find the rise and the run of the graph

6. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Draw a straight line through the graphed points. ● Pick ANY two points on the line. ● Find rise (Δy) ● Find run (Δx)

7. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● For distance vs. time graphs rise/run = distance/time

8. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● For distance vs. time graphs slope = distance/time = avg speed

9. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Interpreting Distance/Time Graphs

10. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Interpreting Distance/Time Graphs Describe how the object is moving. 1). 0 → A 2). A → B 3). B → end

11. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Interpreting Distance/Time Graphs HOW is the object moving? 1). Away at steady speed 2). Not moving 3). Away at a faster speed

12. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Interpreting Distance/Time Graphs What is the object’s speed? 1). 0 → A 2). A → B 3). B → end

13. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs
● Interpreting Distance/Time Graphs
What is the object’s speed?
1). 0 → A
0.6m/s
2). A → B
Zero
3). B → end
2.0m/s

14. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs ● Interpreting Distance/Time Graphs What is the object’s velocity? 1). 0 → A 2). A → B 3). B → end

15. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs
● Interpreting Distance/Time Graphs
What is the object’s velocity?
1). 0 → A
0.6m/s away
2). A → B
Zero
3). B → end
2.0m/s away

16. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs
● Interpreting Distance/Time Graphs
Do Practice Problems p. 370 (1,2)

17. Physical Science: Chapter 11, Motion
Distance vs. Time Graphs
● Interpreting Distance/Time Graphs
Do Practice Problems p. 370 (1,2)
1). Red line has larger slope.
slope = speed = 4 m/s
2). Green line has the smallest slope
Green is moving slowest, blue is in middle, red is moving fastest.

18. Physical Science: Chapter 11, Motion
Mini-Quiz #3
A car drives the 16km from SHS to OBHS in 0.5h.
1). What was its average speed?
2). What was its velocity?
3). How long would it take to travel the 20km
to Tunica at 50km/hr ?
4). How far is it to Tupelo, if it took 2.5hr at
70km/hr?

19. Physical Science: Chapter 11, Motion
Mini-Quiz #3: What is the object’s velocity ? 5). 0-4s 6). 4s-6s 7). 6s-10s 8). 10s-12s

20. Physical Science: Chapter 11, Motion
Mini-Quiz #3 (Answers)
A car drives from the 16km from SHS to OBHS in 0.5h.
1). What was its average speed? 32km/h
2). What was its velocity? 32km/h, EAST
3). How long would it take to travel the 20km to
Tunica at 50km/hr? 0.4h
4). How far is it to Tupelo, if it took 2.5hr at 70km/hr?
175km

21. Physical Science: Chapter 11, Motion
Mini-Quiz #3 (Answers)
What is the object’s velocity ?
5). 0-4s
(5m/s, away)
6). 4s-6s (0 m/s)
7). 6s-10s
8). 10s-12s
(10m/s, back)

22. Physical Science: Chapter 11, Motion
THINGS TO KNOW 1). What is a frame of reference? 2). What is the difference between displacement and distance? 3). What is the difference between speed and velocity? 4). What is the formula for average speed?

23. Physical Science: Chapter 11, Motion
THINGS TO KNOW 5). What is instantaneous speed? 6). List three “frames of reference.” 7). Be able to calculate average speed, distance moved or time from the average speed formula. 8). Be able create distance-time graphs and to find average speeds.

24. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
1). What two things does velocity
show?
2). What is the difference between
displacement and distance?
3). On distance-time graphs, which
one is plotted on the y axis?
4). What is the formula for average
speed?

25. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
5). What is the difference between
average and instantaneous speed?
6). How far will a ball roll, if it moves
at 3.5m/s for 18 seconds?
7). What is the average speed of a car
that travels 180km in 3h?
8). How long will it take a plane
traveling at 1000km/h to travel
2750km?

26. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz Use the following graph to answer questions #9-11.

27. Physical Science: Chapter 11, Motion

28. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz 9). What is the object’s average speed from 3s to 7s? 10). What is the object’s average speed from 7s to 9s? 11). What is the object’s average velocity from 9s to 12s?

29. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz (Answers)
1). What two things does velocity show? (1 pt each)
Speed AND direction of movement
2). Difference between displacement & distance? (2 pts)
Distance is the total path (distance
traveled); displacement is the distance
from the starting point.
3). On distance-time graphs, which is on y axis?(2 pts)
Distance

30. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
4). What is the formula for average speed? (3 pts)
Avg Speed = Distance/Time
5). Difference between average & instantaneous speed?
(2 pts)
Average speed is the total distance divided by total time; instantaneous speed is the speed at one specific time.

31. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
6). How far will a ball roll, if it moves at 3.5m/s for 18
seconds? (2 pts)
Distance = Avg Speed x time
Distance = 3.5m/s x 18s = 63m

32. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
7). What is the average speed of a car that travels
180km in 3h? (2 pts)
Avg Speed = Distance = 180km = 60km/h
Time h
8). How long will it take a plane traveling at 1000km/h to
travel 2750km? (2 pts)
Time = distance = km = h
Avg Speed km/h

33. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
9). What is the avg speed from 3s to 7s? (2 pts)
rise = Δ y = 15m – 5m = 2.5m/s
run Δ x s – 3 s

34. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
10). What is the average speed from 7s to 9s? (2 pts)
rise = Δ y = 15m – 15m = 0m/s
run Δ x s – 7s

35. Physical Science: Chapter 11, Motion
Chapter 11 Section 1 Quiz
11). What is the avg velocity from 9s to 12s? (4 pts)
rise = Δ y = 0m – 15m = -5m/s
run Δ x 12s – 9s
VELOCITY is
5 m/s back to
the starting
point