5 km/h 5 km/s - 5 km/ h•s 5 km/ h•s 35 km/h 40 km/ h•s 45 km/h 50 km/ h•s

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# 5 km/h 5 km/s - 5 km/ h•s 5 km/ h•s 35 km/h 40 km/ h•s 45 km/h 50 km/ h•s - PowerPoint PPT Presentation

think! Suppose a car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, then from 45 to 50 km/h. What is its acceleration?. 5 km/h 5 km/s - 5 km/ h•s 5 km/ h•s 35 km/h 40 km/ h•s 45 km/h 50 km/ h•s.

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## PowerPoint Slideshow about ' 5 km/h 5 km/s - 5 km/ h•s 5 km/ h•s 35 km/h 40 km/ h•s 45 km/h 50 km/ h•s' - tariq

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Presentation Transcript

think!Suppose a car moving in a straight line steadily increases its speed each second, first from 35 to 40 km/h, then from 40 to 45 km/h, then from 45 to 50 km/h. What is its acceleration?

• 5 km/h
• 5 km/s
• -5 km/h•s
• 5 km/h•s
• 35 km/h
• 40 km/h•s
• 45 km/h
• 50 km/h•s

Don’t forget: You can copy-paste this slide into other presentations, and move or resize the poll.

Poll: Suppose a car moving in a straight line ...

What should I be thinking as I answer this question…
• Acceleration has TWO units of time, which rules out some of my answers:
• 5 km/h
• 5 km/s
• -5 km/h•s
• 5 km/h•s
• 35 km/h
• 40 km/h•s
• 45 km/h
• 50 km/h•s
What should I be thinking as I answer this question…
• Acceleration is the CHANGE in velocity divided by time… which means it is the FINAL VELOCITY – INITIAL VELOCITY. In this case, I know the car is SPEEDING UP, which is a POSITIVE acceleration:

-5 km/h•s

5 km/h•s

40 km/h•s

50 km/h•s

What should I be thinking as I answer this question…
• Acceleration is the CHANGE in velocity divided by time… which means:
• It is the FINAL VELOCITY – INITIAL VELOCITY, divided by the change in time. In this case, the car is CHANGING its velocity by 5 km/h every 1 s… so, 5 km/h divided by 1s =

-5 km/h•s

5 km/h•s

40 km/h•s

50 km/h•s

think!In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h, while a truck goes from rest to 15 km/h in a straight line. Which undergoes greater acceleration? What is the acceleration of each vehicle?

• The car undergoes the greater acceleration because it is moving faster than the truck (5065 km/h)
• The truck undergoes the greater acceleration because it is more massive than the car
• They both undergo the same acceleration because they both change their velocity by the same amount (inc. of 15 km/h) in the same time interval (5 s )

Don’t forget: You can copy-paste this slide into other presentations, and move or resize the poll.

What should I be thinking as I answer this question…
• Acceleration is the CHANGE in VELOCITY, divided by time…
• Both vehicles CHANGE their velocity by 15 km/h
• More specifically…Both vehicles INCREASE their velocity by 15 km/h
• Both vehicles make this CHANGE in the same amount of time…
• Both vehicles have the same acceleration!
• **Acceleration is NOT how fast you move; it is how quicklyyou can CHANGE how fast you move.
Peer Review HW
• You have 5 minutes to meet with peers and discuss HW.