1. Objective: Don’t have a sheet at the end
Vocabulary Tag
5 Minutes
Objective: Don’t have a sheet at the end
If you have a sheet read off a definition to a classmate
If they guess an incorrect term give them the sheet
If they guess correctly, move on to the next person

2. Speed, Velocity, and Acceleration

3. Speed The amount of distance traveled per unit of time.
Speed= Distance
Time

4. FRICTION
Friction is a contact force that opposes motion, it causes heat, damage, wear and slowing
 Friction can be reduced by…
lubrication,
streamlining (aerodynamics),
slowing down,
smoothing surfaces
EXPT sliding on oil or sandpaper or bike stopping on dry, wet surface 4

5. Speed, Distance, Time Formulas

6. Formula Triangle

7. How to Use the Formula Triangle

8. Calculating Speed Given Distance & Time
Divide Distance by Time
Distance ÷ Time = Speed
Speed = Distance ÷ Time

9. Practice: Angie ran 15 meters in 5 seconds. What was her speed?
Speed = Distance
Time
Speed= 15 m
5 s S T
Speed = 3 m/s

10. Practice: Angie ran 100 meters in 10 seconds. What was her speed?
Speed = Distance
Time
Speed= 100 m
10 s S T
Speed = 10 m/s

11. Calculating Distance Given Speed & Time
Multiply Speed and Time
Distance = Speed X Time
Speed X Time = Distance

12. Practice:
If a car is traveling at 20 m/s, how far will it travel in 60 seconds? D
Distance = Speed X Time
Distance = 20 m/s X 60 s S T
Distance = 1,200 m

13. Practice:
If a car is traveling at 100 m/s, how far will it travel in 60 seconds? D
Distance = Speed X Time
Distance = 100 m/s X 60 s S T
Distance = 6,000 m

14. Calculating Time Given Distance and Speed
Divide Distance by Time
Distance ÷ Speed = Time
Time = Distance ÷ Speed

15. Practice:
A train traveled at a speed of 50 m/s. How long did it take the train to travel 3,000 m? D
Time = Distance
Speed
Time = 3,000 m
50 m/s S T
Time = 60 s

16. Practice:
A train traveled at a speed of 100 m/s. How long did it take the train to travel 3,000 m? D
Time = Distance
Speed
Time = 3,000 m
100 m/s S T
Time = 30 s

17. Ticket Out the Door
Put name and period on a scrap piece of paper, write answer, put paper in the appropriate folder as you leave.
GREEN = I Know It
YELLOW = I Sort of Know It
Red = I Don’t Get it
What is the speed of an object that goes 5 cm in 1 second
How much time does it take for a person walking 1000cm/s to travel 5000 cm
What distance does a person walk in 1 minute if they travel at 1 meter per second

18. Problems from Yesterday
What is the speed of an object that goes 5 cm in 1 second

19. Problems from Yesterday
2. How much time does it take for a person walking 1000cm/s to travel 5000 cm

20. Problems from Yesterday
3. What distance does a person walk in 1 minute if they travel at 1 meter per second

21. Interpret The Graph Below:

22. FRICTION
Friction is a contact force that opposes motion, it causes heat, damage, wear and slowing
Usually the increase mass results in the increase of Friction Forces.
 Friction can be reduced by…
Lubrication streamlining (aerodynamics),
slowing down,
smoothing surfaces
Example: sliding on oil or sandpaper or bike stopping on dry versus wet surface
EXPT sliding on oil or sandpaper or bike stopping on dry, wet surface 22

23. Velocity Velocity is like speed, but it includes a change in position.
Velocity is stated as speed and direction
Example:
The car was traveling at 60 miles per hour to the east.

24. Velocity (continued) Stand up and take 2 steps backwards.
Now take 2 steps forward.
Did you walk at a certain speed?
Yes. You took a total of 4 steps over the span of a few seconds.
Do you have velocity?
No, because your position didn’t change. You ended at the same point you started at.

25. Acceleration
Acceleration is the rate at which an object’s velocity changes.
This includes
Changing speed
Changing direction

26. Acceleration
Acceleration is the rate at which an object’s velocity changes.
Acceleration Formula:
Change in Velocity
Change in time

27. Acceleration
Example: 50m/s – 0m/s = 5s – 0s 50 m/s 10m/s = or 10m/s/s 5s 1s
Instructions for Calculating Acceleration: End Velocity – Start Velocity Ending Time – Starting Time

28. Answer These in Notes
A sky diver jumps out of a plane and in 5.4 seconds falls meters.
What is the sky divers average speed?
What was the sky divers average acceleration
3. Do you think this skydiver would continue to accelerate?

29. Motion Graphs

30. DISTANCE/TIME GRAPHS
A car takes 1.5 minutes to travel 500m down a busy road. It stops at lights for 30 seconds, then continues on for 1 minute as it goes another 1km.
Plot this on a distance/time graph.
Distance
(km)
0.5 1
1.5
Δd = 1km
Steepest section is fastest
Using the distance/time graph:
What is the total distance traveled?
2. In what part of the trip is the car going the fastest?
3. What is the fastest speed?
= 1.5 km
Δt = 1min
EXPT H/O speed challenge or Gather own data from 100m and draw some graphs
= part 3
Time (min) 1 2 3
v = Δd / Δt
v = 1km/1min
In a distance/time graph the slope of the line = the speed of the object. 30

31. Interpret The Graph Below:

32. Interpret The Graph Below:
The graph shows an object which is not moving (at rest).
The distance stays the same as time goes by because it is not moving.

33. Interpret The Graph Below:

34. Interpret The Graph Below:
The graph shows that the objects distance increases as time passes. The object is moving and so it has velocity.
The straight line shows it is a constant (not changing).

35. Interpret The Graph Below:

36. Interpret The Graph Below:
Just like the previous graph, this graph shows an object moving with constant velocity

37. Interpret The Graph Below:

38. Interpret The Graph Below:
The curve in the graph shows that the objects velocity is changing as time passes.
This is acceleration.

39. Interpret The Graph Below:
In the first part of the graph the object is moving with constant velocity.
In the second part of the graph the object is at rest (not moving).
In the third part the object is again moving with constant velocity.

40. SPEED QUESTIONS What would these look like on a distance/time graph?
1. stopped
2. slow
3. fast
4. accelerating 40

41. Answer In Notes
What is the speed of an object that goes 10 cm in 2 seconds
How much time does it take for a person walking 500cm/s to travel cm
What distance does a person run in 1 minute if they travel at 5 m/s
Draw an Speed Graph and make one line for constant speed, one for acceleration, and one for stopped.

42. Interpret The Graph Below:

43. Interpret The Graph Below:
The graph shows that the objects velocity does not change as time passes.
It shows constant velocity.

44. Interpret The Graph Below:

45. Interpret The Graph Below:
The graph shows that the objects velocity is increasing as time passes – it is accelerating.
The straight line shows that it is constant acceleration.