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& / or. & / or. & / or. 20. True or False: Acceleration ONLY occurs if the speed INCREASES. True False Not enough info to say Not sure. 21. If velocity in a vehicle is CONSTANT, is the vehicle accelerating?. Yes No Not enough info to say Not sure.

chandler-sanders
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  1. & / or & / or & / or

  2. 20. True or False: Acceleration ONLY occurs if the speed INCREASES • True • False • Not enough info to say • Not sure

  3. 21. If velocity in a vehicle is CONSTANT, is the vehicle accelerating? • Yes • No • Not enough info to say • Not sure

  4. 22. Suppose you are driving a car at a constant velocity of 50 mi/h. What is your acceleration? • 0 • Less than 50, but not 0 • More than 50 • Not enough info to say • Not sure

  5. 23. 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? • 0 • 5 km/h s • Less than 5 km/h s • More than5 km/h s • Not sure

  6. 24. In 5 seconds a car moving in a straight line increases its speed from 50 km/h to 65 km/h. During those same 5 seconds, a truck goes from rest to 15 km/h. Which has the larger acceleration? • Car • Truck • Same • Not sure

  7. 25. Is it possible to be moving but not accelerating? • Yes • No • Not enough info to say • Not sure

  8. 26. Why is it that an object can accelerate while traveling at constant speed, but not at constant velocity? Because it can travel at a constant speed and CHANGE DIRECTION (accelerating!) But…constant velocity means it’s not changing velocity, and therefore not accelerating

  9. 27. Light travels in a straight line at a constant speed of 300,000 km/s. What is the light´s acceleration? • 0 • Less than 300,000 but not 0 • More than 300,000 • Not enough info to say • Not sure

  10. 28. Which has more acceleration when moving in a straight line- a car increasing its speed from 50 to 60 km/hr, or a bicycle that goes from zero to 10 km/hr in the same time? • Car • Bike • Same • Not enough info to say • Not sure

  11. Now, take out your HW from last night…POGIL • 4 minutes to check, correct, ask questions, and get the help you need.

  12. Now, take out your HW from 2 nights ago… p. 25, #9-14 • a = -10 m/s2 or -10m/s.s in a straight line (**Slowing down negative acceleration!**) • a = 2 mi/h.s east (Speeding up  +acceleration!) • Final velocity = 100 m/s in a straight line • Initial velocity = 20 m/s in a straight line **CAREFUL! Your units MUST MATCH on both sides of the equation! USE DA!** Is the final velocity even reasonable? NO WAY! The final velocity is 140 m/s which is about 313 miles per hour!

  13. 9. What quantity describes how quickly you change how fast you’re traveling, or how quickly you change direction? • Speed • Velocity • Acceleration • Distance • Displacement • Not sure

  14. 10. Acceleration is the rate at which what CHANGES?? • Speed • Velocity • Acceleration • Distance • Displacement • Not sure

  15. 11. What is the acceleration of a car that travels in a straight line at a constant speed of 100 km/h in 10 s? • 0 • 10 km/hs in a straight line • 100 km/hs in a straight line • 1000 km/hs in a straight line • Answer is not listed • Not sure

  16. 12. What is the acceleration of a car moving along a straight-line path that increases its speed from zero to 100 km/h in 10s? • 0 • 10 km/hs in a straight line • 100 km/hs in a straight line • 1000 km/hs in a straight line • Answer is not listed • Not sure

  17. 13. By how much does the speed of a vehicle moving in a straight line change each second when it is accelerating at… 2 km/ h/s? At 4 km/h/s? At 10 km/h/s? 2 km/h 4 km/h 10 km/h

  18. 14. Why does the unit of time enter twice in the unit of acceleration? Because acceleration is a rate of a rate. Or, once for velocity and again for accleration Etc.

  19. LABS Returned • In lab groups, you are to review the comments on the graded copy together • You must ALL make corrections on your OWN PAPERS for complete • (the notes become your study tool for the TEST, and an aid during QUIZZES) • Project Managers can ask me questions about the grading if needed. • You are also getting quizzes back – please MAKE CORRECTIONS for the same reasons as above!

  20. 1 m/s 5 s • 1 m/s to the right, because… • constant velocity • Or not speeding up, slowing down, or changing direction • Or we are told to neglect friction, so no increase or decrease in velocity ETC..

  21. Distance = the quantity: initial velocity multiplied by time. This is added to the quantity: one half the acceleration multiplied by the square of the time

  22. If something starts from REST…how can this equation be simplified? d = ½ a(Δt)2 Distance = the quantity: one half the acceleration multiplied by the square of the time

  23. Do you notice a pattern with the velocities? Increasing by 2m/s EACH SECOND

  24. ID Name Class Date

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