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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


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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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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
slide3

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

what should i be thinking as i answer this question
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 question1
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 question2
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

slide7

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 )
slide8

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what should i be thinking as i answer this question3
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
Peer Review HW
  • You have 5 minutes to meet with peers and discuss HW.
  • Questions? Ask a teacher!
  • Done? Get started on Concept Development! (See teacher for a copy)
concept attainment
Concept Attainment…
  • As a class, we are going to complete #1 on page 3  See the board
  • Right Now: finish concept attainment; check in at stop signs (will have a few minutes next class to finish checking in)
  • EXIT SLIP – 5 minutes before end of class; turn in when done
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