Welcome Back to Physics

Your 5 minutes starts now

Objective: I can draw a position vs time graph, and use 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, and use 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, and use 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, and use 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!

Agenda 1.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. TIME Shows 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?

Example Travon is in an elevator. He rides it up 3 floors, then down two floors, then up 1 floor. What is his displacement? 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?

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? floors

Velocity

Ratio of displacement to time VECTOR

Velocity A submarine goes down 100 m, then up 50 m.

Velocity A submarine goes down 100 m, then up 50 m. Displacement: Distance:

Velocity A submarine goes down 100 m, then up 50 m. Displacement: 50 m down Distance: 150 m

Velocity A submarine goes down 100 m, then up 50 m. The whole process takes 50 s. Velocity:

Velocity A submarine goes down 100 m, then up 50 m. The whole process takes 50 s. Velocity: 50 m down / 50 s =

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

Velocity SI units? v = d/t…

Velocity SI units: meters per second (m/s) v = d/t…