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Understanding Acceleration in a Straight Line Motion

Learn about acceleration in straight line motion with an interactive poll and concept explanations. Understand how velocities change and determine acceleration. Discover the relationship between speed and acceleration in a car and a truck scenario.

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Understanding Acceleration in a Straight Line Motion

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  1. 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

  2. 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 ...

  3. 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

  4. 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

  5. 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

  6. 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 )

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

  8. 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.

  9. 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)

  10. Do you notice a pattern with the velocities?

  11. 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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