What do you see?/ What do you think? Wednesday, September 7th
*What factors affect the time you need to react to an emergency situation while driving? 1. How fast you're going 2. How far away you are from object ahead of you 3. How much weight is in the car/ how much the vehicle weighs 4. How aware you are of what is in front of you. 5. Being under the influence affects your reaction time. 6. Depends whether there's an incline in the hill, if you're going up it takes less time to stop as if you were going down hill it would take longer.
Method B. Dropping stick: jyll: 24 cm [.22 seconds] mel: 25 cm [.23 seconds] kim: 24 cm [.22 seconds] Avg: 24.3cm [.225 seconds]
Method B. Dropping & texing while doing the red green method of making a decision: kim: 21 [.21 seconds] nicky: 25 [.23 seconds] jyll: 22 [.229 seconds] Avg: .223 seconds -How does your reaction time with needing to make a decision compare with your reaction time without needing to make a decision? Dropping with a decision showed to have a shorter reaction time. most likely because Method B without a decision had given practice. -What does this difference in reaction time when making a decision apply to your ability to avoid road hazards? sometimes while on the road you have to make sudden decisions that aren't expected. In this case it was the fact that you didn't know whether your partner was going to say "red" or "green", but this could apply to a lot while operating a vehicle.
Method C. Dropping red & green: kim: 15cm, 18cm, 10cm, 13cm, 10cm jill: 22cm, 17cm, 21cm, 11cm, 15cm nicky: 24cm , 21cm, 16cm , 19cm , 13cm alex: 6cm, 18cm, 20cm, 18cm, 16cm, mel: 25cm, 12cm, 22cm, 19cm, 20cm Avg: 20cm -How does your reaction time with needing to make a decision compare with your reaction time without needing to make a decision? Dropping with a decision showed to have a shorter reaction time. most likely because Method B without a decision had given practice. -What does this difference in reaction time when making a decision apply to your ability to avoid road hazards? sometimes while on the road you have to make sudden decisions that aren't expected. In this case it was the fact that you didn't know whether your partner was going to say "red" or "green", but this could apply to a lot while operating a vehicle.
1)Record all 5 reaction times and an average reaction time. kim: 15cm, 18cm, 10cm, 13cm, 10cm jill: 22cm, 17cm, 21cm, 11cm, 15cm nicky: 24cm , 21cm, 16cm , 19cm , 13cm alex: 6cm, 18cm, 20cm, 18cm, 16cm, mel: 25cm, 12cm, 22cm, 19cm, 20cm Avg: 20cm
1)Record all 5 reaction times and an average reaction time. Kim: 21 [.21 seconds] Nicky: 25 [.23 seconds] Jyll: 22 [.229 seconds] Avg: .223 seconds
1)How does your reaction time with needing to make a decision while distracted with texting compare with your reaction time without the distraction of texting? The avg. reaction time with the distraction of texting was higher.
1)What does this difference in reaction time when distracted apply to your ability to avoid road hazards while texting? While texting your reaction time is thrown off because you're not paying as much attention to what is going on. This apply's for catching a ruler, and on the road. you are more prone to an accident while distracted by something, especially texting.
Physics Talk (pages 12-13) Wednesday, September 7th
1. How do distractions affect reaction time?
Distractions make you have a slower reaction time. You are not fully paying attention to the road so when something happens, it takes you longer to react making you have a slower reaction time.
2. Why is driving under the influence of alcohol or drugs illegal?
Alcohol and drugs can slow down your reaction time greatly. If you are not reacting in time, you are more likely to get into a car crash.
3. Name three factors in addition to distractions and drugs or alcohol that can affect reaction time.
Age, gender, and fatigue can also affect reaction time according to psychologists.
Reaction Time: Science of Fastball Friday, September 9th
log onto http://www.exploratorium.edu/baseball/reactiontime.html 1.)A fastball that is going 90 miles per hour takes about a half a second to reach home plate. 2.)because if it takes the ball .5 seconds to hit home plate you're reaction time has to be under .5 seconds, and if it is over, you will strike out. 3.) You need to estimate how far away the ball is from you, you have to be alert of where the ball is. 4.)No because no one in real life can have a reaction time of .1-.2 seconds. 5.)While driving and you see an obstruction ahead, you need to slow down to reduce your reaction time. with a pitch keep you're eye on the ball so you know where it is at all times, and your reaction time will be lower because you are alert of how far the ball is away from you. 6.) They are trying to distract the batter, which is the same as texting while driving, it will mess you up.
Active Physics Plus Friday, September 9th
d= 1/2at^2
d=distace an object is dropped. (cm)
t=time it take the object to drop. "d" (s)
a=acceleration of the object.(980cm/s^2)
d=1/2at^2
d=cm t=(S)^2 a=cm/(s)^2
Distance
Time
4.9cm
.1s
19.6cm
.2s
44.1cm
.3s
Reaction Time Ruler
Friday, September 9th
Distance
Time
9.8cm
.025s
24.5cm
.05s
36.75
.075s
49cm
.1s
61.25cm
.125s
73.5cm
.15s
85.75cm
.175s
98cm
.2s
110.25
.225
Reaction_Time_Ruler.jpg
DoNow
Monday, September 12th
No because a race car driver has no distractions, whereas someone driving in a school zone has many obstacles such as children and other people. But on the other hand a racecar driver is going much, much faster then someone driving in a school zone, so they need more time to stop.
Can you catch a dollar bill?
Monday, September 12th
dollar bill: d=15.4(cm)
reaction time needed to catch the dollar bill:
d=1/2at^2
15.4(cm)=1/2 (980cm/s^2) t^2
15.4(cm)=(490cm/s^2)t^2
15.4(cm)=(490cm/s^2)/(490cm/s^2)
square root of .0314s^2= Square root t^2 .177s=t
Homework "Measuring Parent's Reaction Time" Monday, September 12th
DoNow: Physics To Go #6,7 pg. 20
Wednesday, September 14th
6.) With a slow reaction time, you have a much greater risk of having an accident with a slower reaction time rather then someone with a fast one. You lose the ability to stop when needed or avoid accidents and cars that come out of no where.
7.) Auto insurance is more expensive for teenagers because teenagers are statistically more prone to accidents, they are more likely to be talking on their cellphones, drinking and driving. also they break the rules such as having more than 1 friend in the care, and driving under the influence.
Reflecting on the Chapter Challenge p. 18
Wednesday, September 14th
- What are the top two causes of accidents on the road are rubbernecking, and driver fatigue.
- Rubbernecking: a person who turns their head to stare at something in a foolish manner, esp. while driving a car.
Section 1 Quiz.
-Know how to measure time to move your foot
-know how to measure reaction time with stopwatches.
Dropping ruler with decisions and distractions.
-Alcohol/ Drug
-Distractions while driving that affect your reaction time. (talking on cellphone or texting)
-Driver Fatigue, Rubberneckng.
What do you see?/ What do you think?
Wednesday, September 7th
*What factors affect the time you need to react to an emergency situation while driving?
1. How fast you're going
2. How far away you are from object ahead of you
3. How much weight is in the car/ how much the vehicle weighs
4. How aware you are of what is in front of you.
5. Being under the influence affects your reaction time.
6. Depends whether there's an incline in the hill, if you're going up it takes less time to stop as if you were going down hill it would take longer.
Investigation Group 6
Wednesday, September 7th
Foot pedal
kim: 39 steps [2.6 seconds]
nicky: 42 steps [2.4 seconds]
Method A. Starting and stopping (seconds):
alex: (s)8.63 | 12.36 | (s)4.84
nicky: 8.89 | (s)12.15 | 5.11
average- .56
kim: (s)5.51 | 5.84 | (s)7.53
jyll: 5.83 | (s)5.68 | 7.63
average- .193
Method B. Dropping stick:
jyll: 24 cm [.22 seconds]
mel: 25 cm [.23 seconds]
kim: 24 cm [.22 seconds]
Avg: 24.3cm [.225 seconds]
Method B. Dropping & texing while doing the red green method of making a decision:
kim: 21 [.21 seconds]
nicky: 25 [.23 seconds]
jyll: 22 [.229 seconds]
Avg: .223 seconds
-How does your reaction time with needing to make a decision compare with your reaction time without needing to make a decision?
Dropping with a decision showed to have a shorter reaction time. most likely because Method B without a decision had given practice.
-What does this difference in reaction time when making a decision apply to your ability to avoid road hazards?
sometimes while on the road you have to make sudden decisions that aren't expected. In this case it was the fact that you didn't know whether your partner was going to say "red" or "green", but this could apply to a lot while operating a vehicle.
Method C. Dropping red & green:
kim: 15cm, 18cm, 10cm, 13cm, 10cm
jill: 22cm, 17cm, 21cm, 11cm, 15cm
nicky: 24cm , 21cm, 16cm , 19cm , 13cm
alex: 6cm, 18cm, 20cm, 18cm, 16cm,
mel: 25cm, 12cm, 22cm, 19cm, 20cm
Avg: 20cm
-How does your reaction time with needing to make a decision compare with your reaction time without needing to make a decision?
Dropping with a decision showed to have a shorter reaction time. most likely because Method B without a decision had given practice.
-What does this difference in reaction time when making a decision apply to your ability to avoid road hazards?
sometimes while on the road you have to make sudden decisions that aren't expected. In this case it was the fact that you didn't know whether your partner was going to say "red" or "green", but this could apply to a lot while operating a vehicle.
1) Record all 5 reaction times and an average reaction time.
kim: 15cm, 18cm, 10cm, 13cm, 10cm
jill: 22cm, 17cm, 21cm, 11cm, 15cm
nicky: 24cm , 21cm, 16cm , 19cm , 13cm
alex: 6cm, 18cm, 20cm, 18cm, 16cm,
mel: 25cm, 12cm, 22cm, 19cm, 20cm
Avg: 20cm
1) Record all 5 reaction times and an average reaction time.
Kim: 21 [.21 seconds]
Nicky: 25 [.23 seconds]
Jyll: 22 [.229 seconds]
Avg: .223 seconds
1) How does your reaction time with needing to make a decision while distracted with texting compare with your reaction time without the distraction of texting?
The avg. reaction time with the distraction of texting was higher.
1) What does this difference in reaction time when distracted apply to your ability to avoid road hazards while texting?
While texting your reaction time is thrown off because you're not paying as much attention to what is going on. This apply's for catching a ruler, and on the road. you are more prone to an accident while distracted by something, especially texting.
Physics Talk (pages 12-13)
Wednesday, September 7th
1. How do distractions affect reaction time?
Distractions make you have a slower reaction time. You are not fully paying attention to the road so when something happens, it takes you longer to react making you have a slower reaction time.
2. Why is driving under the influence of alcohol or drugs illegal?
Alcohol and drugs can slow down your reaction time greatly. If you are not reacting in time, you are more likely to get into a car crash.
3. Name three factors in addition to distractions and drugs or alcohol that can affect reaction time.
Age, gender, and fatigue can also affect reaction time according to psychologists.
Reaction Time: Science of Fastball
Friday, September 9th
log onto http://www.exploratorium.edu/baseball/reactiontime.html
1.)A fastball that is going 90 miles per hour takes about a half a second to reach home plate.
2.)because if it takes the ball .5 seconds to hit home plate you're reaction time has to be under .5 seconds, and if it is over, you will strike out.
3.) You need to estimate how far away the ball is from you, you have to be alert of where the ball is.
4.)No because no one in real life can have a reaction time of .1-.2 seconds.
5.)While driving and you see an obstruction ahead, you need to slow down to reduce your reaction time. with a pitch keep you're eye on the ball so you know where it is at all times, and your reaction time will be lower because you are alert of how far the ball is away from you.
6.) They are trying to distract the batter, which is the same as texting while driving, it will mess you up.
Active Physics Plus
Friday, September 9th
d= 1/2at^2
d=distace an object is dropped. (cm)
t=time it take the object to drop. "d" (s)
a=acceleration of the object.(980cm/s^2)
d=1/2at^2
d=cm t=(S)^2 a=cm/(s)^2
Reaction Time Ruler
Friday, September 9th
DoNow
Monday, September 12th
No because a race car driver has no distractions, whereas someone driving in a school zone has many obstacles such as children and other people. But on the other hand a racecar driver is going much, much faster then someone driving in a school zone, so they need more time to stop.
Can you catch a dollar bill?
Monday, September 12th
dollar bill: d=15.4(cm)
reaction time needed to catch the dollar bill:
d=1/2at^2
15.4(cm)=1/2 (980cm/s^2) t^2
15.4(cm)=(490cm/s^2)t^2
15.4(cm)=(490cm/s^2)/(490cm/s^2)
square root of .0314s^2= Square root t^2
.177s=t
Homework "Measuring Parent's Reaction Time"
Monday, September 12th
Starting at 0 cm:
.185s (15 cm)
.175s (7.66cm)
.15s (11cm)
.125 (7.6cm)
.075 (2.76cm)
average= .65 seconds
DoNow: Physics To Go #6,7 pg. 20
Wednesday, September 14th
6.) With a slow reaction time, you have a much greater risk of having an accident with a slower reaction time rather then someone with a fast one. You lose the ability to stop when needed or avoid accidents and cars that come out of no where.
7.) Auto insurance is more expensive for teenagers because teenagers are statistically more prone to accidents, they are more likely to be talking on their cellphones, drinking and driving. also they break the rules such as having more than 1 friend in the care, and driving under the influence.
Reflecting on the Chapter Challenge p. 18
Wednesday, September 14th
- What are the top two causes of accidents on the road are rubbernecking, and driver fatigue.
- Rubbernecking: a person who turns their head to stare at something in a foolish manner, esp. while driving a car.
Section 1 Quiz.
-Know how to measure time to move your foot
-know how to measure reaction time with stopwatches.
Dropping ruler with decisions and distractions.
-Alcohol/ Drug
-Distractions while driving that affect your reaction time. (talking on cellphone or texting)
-Driver Fatigue, Rubberneckng.