HW Due today

Triple Entry Journal due Oct. 23- NEXT CLASS. TONIGHT’S HW : Read and STUDY 2.0 – 2.4. Do RQ #9-

14 (p. 25, concepts, no math) Need a refresher? Redo RQ #7-8

And finish up to #24 in today’s POGILHW assigned today

On p. 26-27, complete #28-30; 43-44.TEST on Ch. 2 on Monday Nov. 4 – study guides will be given out on Fri.

Do Now: Take one, and a clicker. Projects in IN BOX

Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?List everything you know after reading this problem

Did you reference this? If not, do so now!

Do Now: Take 2 Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?Now, go back and LABEL.Some examples:

Etc…

Do Now: Take 3 Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?Now, SOLVE.1. Find your known variables2. Find your unknown variables3. Write the formula 4. Show all your work USE DIMENSIONAL ANALYSIS WHEN NEEDED!!!

• Plug in your known variables (including units)• Use as many steps as you need to solve the equation and solve for the

unknown variable. (Include your UNITS in every step!)**Show ALL YOUR WORK in this step! If I am able to see your work on

an assessment, you may still be able to get partial credit if your final answer is incorrect! If I can’t see your work, and your final answer is wrong, then you will not get any partial credit for the problem – you will get ZERO points!**

Do Now: Take 4 Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?How fast was he traveling in miles per hour?

Do Now: Take 5 Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?Is he breaking the speed limit if he was on 295?

Do Now: Take 6 Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?If he continued with this acceleration, how fast would he be traveling after…(IN OTHER WORDS, what would his VELOCITY be)…

4 seconds?__________

5 seconds?__________

6 seconds?__________***HINT – no crazy math formulas needed!!! Use Common Sense!***

65 + 20 = 85 m/s east85 + 20 = 105 m/s east105 + 20 = 125 m/s east

Do Now: Take 7 Sonic the Hedgehog was running in a straight line East at a speed of 5m/s and then tucked and rolled down a hill in 3 seconds. During that time, he accelerated at a rate of 20 m/s2. How fast was he going when he reached the bottom of the hill?Reflection What have you learned after this process of CHUNKING our work? EXPLAIN: Was this process helpful to you? EXPLAIN: What is causing you difficulty in this class? EXPLAIN: What HAVE YOU done to better support yourself in this class? What can the teacher(s) do to better support you in this class?

TURN THEM IN! Then, take out HW: POGIL and #9-14

Speed changes by…

Speeding Up

Slowing Down& / or

& / or& / or

If an object is CHANGING VELOCITY BY……

Speeding UpThen it is Positively

Accelerating

Slowing DownThen it is Negatively

Accelerating

Changing direction Then it is ACCELERATING (Centripetal acceleration… we will learn about

this in Ch. 9)

Take out your POGIL HW from last night…

• We are rapidly reviewing #10-24

10. True or false – Acc. Is a vector quantity- EXPLAIN

1 2 3 4

0% 0%0%0%

1. True2. False3. Not enough info4. Not sure

Acceleration is the CHANGE IN VELOCITY divided by time.Since Velocity is a vector, so is acceleration. Add this to your T chart!

11. A car is traveling around a curve on a highway, at a constant speed – is it accelerating?

1 2 3 4

0% 0%0%0%

1. Yes 2. No 3. Not enough info4. Not sure

11. A car is traveling around a curve on a highway, at a constant speed – is it accelerating?

If an object is CHANGING VELOCITY BY……

Speeding UpThen it is Positively

Accelerating

Slowing DownThen it is Negatively

Accelerating

Changing direction Then it is ACCELERATING (Centripetal acceleration… we will learn about

this in Ch. 9)

12. What does the term RATE mean?

Anything divided by timeIt tells you HOW FAST something happensSome examples so far are…• Speed•Rate at which distance is coverd•Velocity•Rate at which position changes•Or rate at which displacement happens•Acceleration •Rate at which velocity changes

13. So… acceleration is the rate at which _____________ changes

1 2 3 4 5 6

0% 0% 0%0%0%0%

1. Speed 2. Velocity 3. Distance4. Displacement 5. Not enough info6. Not sure

14. Which of the following represent units of acceleration? (ignore direction)

A. B. C. D. E. F. G. H. I. J.

0% 0% 0% 0% 0%0%0%0%0%0%

A. 5 kmB. 15 km

s C. 25 s/km

D. 55 km

s2

E. 2 miles per hour per secondF. 5 km

h.sG. D & EH. D & FI. E & FJ. D, E & F

14b. Why did you answer the way you did in 14a?

Acceleration is the RATE at which velocity changes.Velocity is the RATE at which position changes (or the rate at which displacement occurs)So, acceleration needs 2 units of time!

EXTRA QUESTIONWhat do these accelerations mean? In other words…by looking at these accelerations, can you conclude the object is speeding up? Slowing down? How? By how much, how often? Etc…interpret in WORDS

What do these accelerations mean? In other words…by looking at these accelerations, can you conclude the object is speeding up? Slowing down? How? By how much, how often? Etc…interpret in WORDS

This is the same as saying 55 km s . s Every second, the velocity is INCREASING by 55 km/s. (I know it’s increasing because it’s a POSITIVE acceleration, so it must be speeding up.

What do these accelerations mean? In other words…by looking at these accelerations, can you conclude the object is speeding up? Slowing down? How? By how much, how often? Etc…interpret in WORDS

Every second, the velocity is INCREASING by 2 miles per hour. (I know it’s increasing because it’s a POSITIVE acceleration, so it must be speeding up.

What do these accelerations mean? In other words…by looking at these accelerations, can you conclude the object is speeding up? Slowing down? How? By how much, how often? Etc…interpret in WORDS

Every second, the velocity is INCREASING by 5 km/h. (I know it’s increasing because it’s a POSITIVE acceleration, so it must be speeding up.

15. Why is acceleration a rate of a rate?

•Velocity• Rate at which position changes• Or rate at which displacement happens•Acceleration • Rate at which velocity changes

Think of it like this. Velocity (rate) is how fast something is going (i.e. meters/second )Acceleration (rate) is how quickly velocity (rate) changes. i.e. meters/second/second. Acceleration is the rate of change of a rate of velocity... a rate of a rate.

Positive Negative

ZERO – careful here!ZERO – careful here!

Debrief

• 2 minutes to ask a neighbor / teacher about…– any questions from #10-15– Or any troublesome problems

from #16-24 (we’re clicker reviewing these next!)

16. True or False: Acceleration ONLY occurs if the speed INCREASES

1 2 3 4

0% 0%0%0%

1. True2. False3. Not enough info

to say4. Not sure

If an object is CHANGING VELOCITY BY……

Speeding UpThen it is Positively

Accelerating

Slowing DownThen it is Negatively

Accelerating

Changing direction Then it is ACCELERATING (Centripetal acceleration… we will learn about

this in Ch. 9)

17. If velocity in a vehicle is CONSTANT, is the vehicle accelerating?

1 2 3 4

0% 0%0%0%

1. Yes2. No 3. Not enough info

to say4. Not sure

18. Suppose you are driving a car at a constant velocity of 50 mi/h. What is your acceleration?

1 2 3 4 5

0% 0% 0%0%0%

1. 02. Less than 50, but not 03. More than 504. Not enough info to say5. Not sure

19. 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?

1 2 3 4 5

0% 0% 0%0%0%

1. 02. 5 km/h s3. Less than 5 km/h s4. More than5 km/h s5. Not sure

19. 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 sEvery second, it is INCREASING its

velocity by 5 km/h. No math needed! Use common sense!THINK about what the problem is

TELLING YOU!

20. 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. What’s the acceleration of the car?

1 2 3 4 5 6 7 8

0% 0% 0% 0%0%0%0%0%

1. 3 km/h2. 5 km/h3. 15 km/h4. 3 km/hs5. 5 km/hs6. 15 km/hs7. None of the above8. Not sure

20. 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. What’s the acceleration of the Truck?

1 2 3 4 5 6 7 8

0% 0% 0% 0%0%0%0%0%

1. 3 km/h2. 5 km/h3. 15 km/h4. 3 km/hs5. 5 km/hs6. 15 km/hs7. None of the above8. Not sure

20. 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?

1 2 3 4

0% 0%0%0%

1. Car2. Truck3. Same 4. Not sure

• So…You CAN’T assume that the faster you are going, the higher your acceleration.

• Acceleration is NOT how fast you’re moving!• Acceleration is the change in velocity divided by the

time interval • Acceleration describes how quickly velocity

CHANGES– Having a HIGH acceleration does not mean HOW

QUICKLY you can move…– It means HOW QUICKLY you can change your velocity.

21. Is it possible to be moving but not accelerating?

1 2 3 4

0% 0%0%0%

1. Yes2. No 3. Not enough info

to say4. Not sure

If an object is CHANGING VELOCITY BY……

Speeding UpThen it is Positively

Accelerating

Slowing DownThen it is Negatively

Accelerating

Changing direction Then it is ACCELERATING (Centripetal acceleration… we will learn about

this in Ch. 9)

If you’re NOT doing any of these things,

you’re not accelerating!

22. 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 (meaning it’s accelerating!)But…constant velocity means it’s not changing velocity, and therefore not accelerating

23. Light travels in a straight line at a constant speed of 300,000 km/s. What is the light´s acceleration?

1 2 3 4 5

0% 0% 0%0%0%

1. 02. Less than 300,000 but

not 03. More than 300,0004. Not enough info to say5. Not sure

24. 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?

1 2 3 4 5

0% 0% 0%0%0%

1. Car 2. Bike3. Same 4. Not enough info to say5. Not sure

24. 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?1. Car 2. Bike3. Same 4. Not enough info to say5. Not sure

Same CHANGE IN VELOCITY, divided by

the SAME TIME.

Now, take out your HW from last night… p. 25, #9-14

3 minutes to check your neighbor with #9-14 before a

rapid review

9. What quantity describes how quickly you change how fast you’re traveling, or how quickly you change direction?

1 2 3 4 5 6

0% 0% 0%0%0%0%

1. Speed2. Velocity 3. Acceleration4. Distance5. Displacement6. Not sure

10. Acceleration is the rate at which what CHANGES??

1 2 3 4 5 6

0% 0% 0%0%0%0%

1. Speed2. Velocity 3. Acceleration4. Distance5. Displacement6. Not sure

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?

1 2 3 4 5 6

0% 0% 0%0%0%0%

1. 0 2. 10 km/hs in a straight line 3. 100 km/hs in a straight

line 4. 1000 km/hs in a straight

line 5. Answer is not listed 6. Not sure

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?

1 2 3 4 5 6

0% 0% 0%0%0%0%

1. 02. 10 km/hs in a straight line 3. 100 km/hs in a straight line 4. 1000 km/hs in a straight line 5. Answer is not listed 6. Not sure

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/h4 km/h

10 km/h

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.

Now, onto the math…

• #25-28 in your POGIL• Try # 25 on your own based on what we

practiced with

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!

ID Name Class DateQuiz

Grade I EXPECTED to earn

Grade I ACTUALLY earned

WHY?

Give DETAIL here. Was there something YOU could have done differently? Was there something I could have done differently? Were you not prepared? If so, why not? Do you understand NOW? Etc…

LAB

Grade I EXPECTED to earn

Grade I EXPECTED to earn

WHY?

Give DETAIL etc…