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
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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
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otion
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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
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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
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peed