Welcome Back to Physics

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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…

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10 seconds left and counting…

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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…