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Presentation transcript:

Welcome Back to Physics My DogAjax

Your 5 minutes starts now

Objective: I can distinguish between scalar and vector quantities, and calculate displacement. Bellringer Question: A scientist follows the path below. How far has he walked? How far is he from where he started? Your 5 minutes starts now!

Objective: I can distinguish between scalar and vector quantities, and calculate displacement. Bellringer Question: A scientist follows the path below. How far has he walked? How far is he from where he started? 4 minutes left and counting…

Objective: I can distinguish between scalar and vector quantities, and calculate displacement. Bellringer Question: A scientist follows the path below. How far has he walked? How far is he from where he started? 3 minutes left and counting…

Objective: I can distinguish between scalar and vector quantities, and calculate displacement. Bellringer Question: A scientist follows the path below. How far has he walked? How far is he from where he started? 2 minutes left and counting…

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 2.Announcements 3.Guided Notes: Vectors vs. Scalars, Displacement vs. Distance 4.Independent work Homework: What you don’t finish in class on worksheet Study for QUIZ #1 on Friday

Vectors and Scalars Magnitude: size. In scalar and vector quantities, it’s the number. 2 shoes: the magnitude is lbs: the magnitude is miles south: the magnitude is 8.6

Vectors and Scalars Scalar Quantity: a quantity with JUST a magnitude EXAMPLES: Seven birds 15 pounds 8 meters 8 seconds

Vectors and Scalars Vector Quantity: a quantity with a magnitude AND a direction EXAMPLES: 6 meters north 3 steps left 1 mile up 453 inches down

Vectors and Scalars Is it a vector or a scalar? “I went 2 blocks east to the store.” “There are 6 apples in the fridge.” “I have a math class 1 floor up from this room.” “I walked 47 meters” “I walked 47 meters north”

Vectors and Scalars Is it a vector or a scalar? “I went 2 blocks east to the store.” “There are 6 apples in the fridge.” “I have a math class 1 floor up from this room.” “I walked 47 meters” “I walked 47 meters north”

Distance and Displacement Might be tempted to think they are the same thing, BUT THEY ARE NOT. Foundation of many of the other quantities we use in physics--and especially this unit

Distance and Displacement Distance: a SCALAR QUANTITY that means “how much ground an object covered during its motion.” EXAMPLE: If I walk to the far end of the classroom and back, I walked a non- zero distance.

Distance and Displacement Displacement: a VECTOR QUANTITY that means “how far an object is from where it started.” EXAMPLE: If I walk to the far end of the classroom and back I have zero displacement.

Distance and Displacement Think football. Which line shows Jay Cutler’s displacement? Which shows his distance?

Distance and Displacement How to find displacement: 1. Find the vectors in the problem 2. Draw a picture 3. Find how far the object is from where it started

Distance and Displacement How to find distance: 1. Find the magnitudes in the problem 2. Draw a picture 3. Add up all the magnitudes to see how much ground the object covered.

Distance and Displacement Fatima is pacing back and forth in front of Harlan, waiting for the doors to open. She walks north 50 m, then south 60 m, then north 70 m. Displacement: 1.Find the vectors 2.Draw a picture 3.How far from where she started?

Distance and Displacement Fatima is pacing back and forth in front of Harlan, waiting for the doors to open. she walks north 50 m, then south 60 m, then north 70 m. Displacement: 1.Find the vectors 2.Draw a picture 3.How far from where she started?

Distance and Displacement Displacement: 1.Find the vectors 2.Draw a picture 3.How far from where she started? 50 m 60 m 70 m

Distance and Displacement Displacement: 1.Find the vectors 2.Draw a picture 3.How far from where she started? 50 m 60 m 70 m After she walks 50 m North, displacement is 50 m North After she walks 60 m South, displacement is 10 m South After she walks 70 m North, displacement is 60 m South

Distance and Displacement Distance: 1.Find the magnitudes 2.Draw a picture 3.Add the magnitudes: how much ground was covered? 50 m 60 m 70 m After she walks 50 m, distance is 50 m After she walks 60 m more, distance is 110 m After she walks 70 m more, distance is 180 m

Distance and Displacement Xxavier walks 8 m west, then 4 m east, then 2 m west. What distance did he walk? What is his displacement?

Distance and Displacement Bellringer Question: A scientist follows the path below. How far has he walked? How far is he from where he started?

Independent Practice Complete Worksheet What you don’t finish in class you will finish as homework, to be turned in tomorrow for a grade Limited talking is fine, but focus is on the work We’ll stop with 6 min left in class for exit ticket