welcome back to physics. your 5 minutes starts now

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…