Frame of Reference
Transcript of Frame of Reference
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Frame of Reference
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Distance
The length of the path between two points.
Displacement
The difference between the original or starting point and the final
or end position.
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Vector addition
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A boat travels at 150 m due east. It then turns to a heading
and moves 34 m west.
a. What is the distance the boat travelled?
b. What is the displacement of the boat?
184 m
116 m east
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A dog runs the following vectors:
120 m due west
Then turns and runs 320 m due east
Then turns and runs for 275 m west again
a. What is the distance the dog travelled?
b. What is the displacement of the dog?
715 m
75 m west
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The distance traveled over a given amount of time
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V = d / t
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m / s
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Speed over the entire duration of a trip
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Speed at a particular instant in time
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Speed
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Speed with a direction (Vector)
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V = d / t
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Constant Speed
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V = d / t
d = 50 m
t = 5 s
V = 50m / 5s
v = 10 m/s
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V = d / t
V =
d =
t =
?
2,445 m
415 s
V = 2,445 m / 415 s
V = 5.89 m/s towards the sun
V = d / t
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V = d / t
V =
d =
t =
?
250,000 meters
18,000 seconds
V = 250,000 / 18,000
V = 13.89 m/s
V = d / t
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V = d / t
V =
d =
t =
165 m/s
?
30 seconds
d = 165 m/s x 30 seconds
d = 4,950 meters
d = v x t
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• Constant speed
• Away from start
• Constant speed
• Faster than “1”
• Away from start
Stopped
• Constant speed
• Back to start
Stopped
• Constant speed
• Back to start
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A girl walking due north at 1 m/s to her classroom
A robot moving at 10 m/s while moving along a curved track
A man walking at 10 m/s in a circular path
A women walking in straight path at 10 m/s
Velocity
Velocity
Velocity
Speed
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a. What is the displacement of the person from the initial point
in the two day journey?
3 m East
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b. What is the distance travelled by the person from the initial
point in two days?
13 m
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9 m East
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Captain Hook is on his pirate ship about ready to attack an island. A
fisherman is sitting directly to the side of his boat watching the boat.
The Captain fires a cannonball at 20 m/s towards the island. How fast is
the cannonball moving from the fisherman’s perspective?
20 m/s (towards island)
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Captains Hooks boat starts moving at 10 m/s towards the island. If the
Captain fires another shot with his cannon at 20 m/s in the same
direction that the boat is moving, how fast does the cannonball moving
from the same fisherman’s perspective?
30 m/s (towards island)
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The Captains boat is still moving at 10 m/s towards the island, but the
Captain turns the cannon around and fires another shot with his cannon
at 20 m/s towards an oncoming boat. How fast is the cannonball moving
from the fisherman’s perspective?
10 m/s (towards boat)
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New item for your quizzes
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Look at your quiz!!!
Version
“A”
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Look at your quiz!!!
Version
“B”
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100 Points
4 True/False
8 Matching
38 Multiple Choice
All notes in your packet are fair game!!!
No additional time when the class ends. Manage your time
wisely!!!
No cell phones on quiz day!!!
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1st Semester Results
92.6% 6th Period Average
89.3% 5th Period Average
A’s = 29 Students
B’s = 7 Students
C’s = 3 Students
D’s = 0 Students
F’s = 0 Students
Unit 11: Speed/Velocity
Average = 90.9/100 (90.9%)
Test Taken = 39
High: 100 (3 perfect)
Low: 71