1. Unit 5 Lesson 2 Motion and Speed
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2. Learning objectives: Calculate speed. Interpret distance/time graphs
Unit 5 Lesson 2 Motion and Speed
SC.6.P.12.1 Measure and graph distance versus time for an object moving at a constant speed. Interpret this relationship.
Learning objectives: Calculate speed. Interpret distance/time graphs
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3. Unit 5 Lesson 2 Motion and Speed
Speed is a measure of how far something moves (distance) in a given amount of time.
Speed measures how quickly or slowly an object changes its position.
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4. Montez read that bobcats can reach speeds of up to 30 mi/h
Montez read that bobcats can reach speeds of up to 30 mi/h. What does the speed of a bobcat indicate?
A. the time it takes to reach its maximum speed
B. the total amount of time it travels in one direction
C. the distance it travels to move between two points
D. the distance it can travel in a certain amount of time

5. Unit 5 Lesson 2 Motion and Speed
Average speed?
Average speed describes the speed over a stretch of time rather than at any exact moment in time.
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6. Speed It Up! Calculating average speed
Unit 5 Lesson 2 Motion and Speed
Speed It Up!
Calculating average speed
Speed can be calculated by dividing the distance an object travels by the time it takes to cover the distance.
speed = distance/time
s = d/t
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7. Speed It Up! Calculating average speed
Unit 5 Lesson 2 Motion and Speed
Speed It Up!
Calculating average speed
If two objects travel the same distance, the object that takes less time has the greater speed.
An object with a greater speed travels farther in the same time than an object with a lower speed.
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8. The graph below shows the distance a car traveled over 5 seconds while moving on a freeway. What was the average speed of the car?
Speed= distance/time
Speed= 140/5
Speed= 28 m/s

9. Anne and Juan rolled four different objects down a ramp
Anne and Juan rolled four different objects down a ramp. They measured the distance each object rolled and the time until each object came to a stop. They plotted each point and connected it with a line from origin of the graph. Which object had the greatest average speed?
Speed= distance/time
A: 6/1= 6 s/ft
B: 8/2.5= 3.2 s/ft
C: 6/6.8= .88 s/ft
D: 2/6= .33 s/ft

10. Fast Graphs Graphing constant speed
Unit 5 Lesson 2 Motion and Speed
Fast Graphs
Graphing constant speed
Distance-time graphs are used to plot the distance an object travels over time.
Objects moving at a constant speed make a straight line on the graph.
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11. Graphing Constant Speed
Unit 5 Lesson 2 Motion and Speed
Graphing Constant Speed
On a distance-line graph, a change in the slope of a line indicates a change in speed.
If the line gets steep, the object’s speed has increased.
If the line is not too steep, the object has slowed down.
A flat line indicates zero speed.
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12. A delivery driver recorded the distance her van traveled each hour of her workday. The graph below shows the results.
What is the motion of the van during the time between 4 and 5 hour? Between 5 and 8 hour?

13. Every morning Tom walks along a straight road from his home to a bus stop. The graph below shows his journey. Describe what is happening.