welcome back to physics. your 5 minutes starts now
Post on 19-Jan-2016
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Welcome Back to Physics
Your 5 minutes starts now
Objective: I can draw a position vs time graph, anduse it to find an object’s velocity.Bellringer Question:
Orin starts at position = 0. He walks 20 m away from his origin, then 10 m back towards it, then stops. Sketch a position vs. time graph for Orin.
Your 5 minutes starts now!
4 minutes left and counting…
Objective: I can draw a position vs time graph, anduse it to find an object’s velocity.Bellringer Question:
Orin starts at position = 0. He walks 20 m away from his origin, then 10 m back towards it, then stops. Sketch a position vs. time graph for Orin.
3 minutes left and counting…
Objective: I can draw a position vs time graph, anduse it to find an object’s velocity.Bellringer Question:
Orin starts at position = 0. He walks 20 m away from his origin, then 10 m back towards it, then stops. Sketch a position vs. time graph for Orin.
2 minutes left and counting…
Objective: I can draw a position vs time graph, anduse it to find an object’s velocity.
Bellringer Question:
Orin starts at position = 0. He walks 20 m away from his origin, then 10 m back towards it, then stops. Sketch a position vs. time graph for Orin.
1 minute left and counting…
Wrap up your answer And get ready to start the lesson
30 seconds left and counting…
Wrap up your answer And get ready to start the lesson
10 seconds left and counting…
Wrap up your answer And get ready to start the lesson
Time is UP!
Agenda1. Bellringer (5 min)2. Announcements (2 min)3. Finish Graphing Classmates (10
min)4. Quiz review (18 min)5. Exit ticket (5 min)
Homework:• Study for QUIZ #1 on Friday
Time (s)
Position (m)
Time (s)
Position (m)
POSITION vs. TIMEShows where an object is
At different times
Slope of the line = velocity
Finish graphing your classmates. 10 min.
Review
SI Units:
Length:
Time:
Volume:
Mass:
Review
SI Units:
Length: meters
Time: seconds
Volume: liters
Mass: kilograms
Review
SI Units:
Length: meters (m)
Time: seconds (s)
Volume: liters (L)
Mass: kilograms (kg)
Review
• A scalar has ________
• A vector has ________ and _________
Review
• A scalar has magnitude
• A vector has magnitude and direction
Review
• Distance?
• Displacement?
Review
• Distance: scalar. How much ground was covered.
• Displacement: vector. How far you are from where you started.
Example
Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his displacement?
Example
Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his displacement?
Example
Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his displacement?
1
2
3
4
Example
Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his displacement?
1
2
3
4
3 floors
Example
Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his distance traveled?
1
2
3
4
Example
Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his distance traveled?
1
2
3
4
6 floors
Velocity
€
v =d
t
Velocity
• Ratio of displacement to time
• VECTOR
€
v =d
t
Velocity
A submarine goes down 100 m, then up 50 m.
€
v =d
t
Velocity
A submarine goes down 100 m, then up 50 m.
Displacement:
Distance:€
v =d
t
Velocity
A submarine goes down 100 m, then up 50 m.
Displacement: 50 m down
Distance: 150 m€
v =d
t
Velocity
A submarine goes down 100 m, then up 50 m. The whole process takes 50 s.
Velocity:
€
v =d
t
Velocity
A submarine goes down 100 m, then up 50 m. The whole process takes 50 s.
Velocity: 50 m down / 50 s =
€
v =d
t
Velocity
A submarine goes down 100 m, then up 50 m. The whole process takes 50 s.
Velocity: 50 m down / 50 s = 1 m/s down
€
v =d
t
Velocity
SI units?
v = d/t…
Velocity
SI units: meters per second (m/s)
v = d/t…
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