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Position describes where an object is, and speed describes Position describes where an object is, and speed describes

Position describes where an object is, and speed describes - PowerPoint Presentation

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Position describes where an object is, and speed describes - PPT Presentation

how fast the object is moving Section 1 Describing Motion K What I Know W What I Want to Find Out L What I Learned 2D Organize analyze evaluate make inferences and predict trends from data ID: 268599

speed motion describing distance motion speed distance describing mcgraw education copyright hill time displacement position object

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Presentation Transcript

Slide1

Position describes where an object is, and speed describes how fast the object is moving.

Section 1: Describing Motion

K

What I Know

W

What I Want to Find Out

L

What I LearnedSlide2

2(D) Organize, analyze, evaluate, make inferences, and predict trends from data.4

(A) Describe and calculate an object’s motion in terms of position, displacement, speed, and acceleration.4(B)

Measure and graph distance and speed as a function of time using moving toys.

Describing Motion

Copyright © McGraw-Hill EducationSlide3

Essential QuestionsHow are distance and displacement different?

How is an object’s speed calculated?What information does a distance-time graph provide?

Describing Motion

Copyright © McGraw-Hill EducationSlide4

Reviewmeter

New

m

otion

d

isplacement

speed

Describing Motion

Copyright © McGraw-Hill Education

VocabularySlide5

Describing Motion

Copyright © McGraw-Hill Education

Vocabulary

Motion

is the change in an object’s position relative to a reference point.

Displacement

is the distance and direction of an object’s change in position.Slide6

Describing Motion

Copyright © McGraw-Hill Education

Adding Displacements

Displacements

in the same direction can be added.

For example:Slide7

Adding DisplacementsDisplacements

in opposite directions can be subtracted.For example, if you walk 10m east and then 5m west, the size of your displacement is:

Describing Motion

Copyright © McGraw-Hill EducationSlide8

Adding DisplacementsDisplacements

that are not in the same direction or in opposite directions cannot be directly added or subtracted. For example, if you walk 4 m east and then 3 m north, your displacement is 5 m in a roughly northeast direction, but the total distance traveled is 7m.

Describing Motion

Copyright © McGraw-Hill EducationSlide9

Speed is the distance an object travels per unit of time.

Calculating SpeedAny change over time is called a rate.If you think of distance as the change in position, then speed is the rate at which distance is traveled or the rate of change is position.Speed

Equation

Describing Motion

Copyright © McGraw-Hill EducationSlide10

Distance-Time Graph

Concepts in Motion

FPO

Add link to concepts in motion animation from page 49 here.

Describing Motion

Copyright © McGraw-Hill EducationSlide11

Changing Speed

Usually speed is not constant.

Think about riding a bicycle for a distance of 5 km, as shown.

Describing Motion

Copyright © McGraw-Hill EducationSlide12

Average SpeedAverage speed describes speed of motion when speed is changing.

Average speed is the total distance traveled divided by the total time of travel. If the total distance traveled was 5 km and the total time was 1/4 h, or 0.25 h.

The average speed was:

Describing Motion

Copyright © McGraw-Hill EducationSlide13

Describing Motion

Copyright © McGraw-Hill Education

Review

Essential Questions

How are distance and displacement different?

How is an object’s speed calculated?

What information does a distance-time graph provided?

Vocabulary

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otiond

isplacement

s

peed