Cuesta College, San Luis Obispo, CA
Sections 70854, 70855
Exam code: quiz04JuR4
Sections 70854, 70855 results
| 0- 6 : | ** [low = 6] |
| 7-12 : | **** |
| 13-18 : | ******* |
| 19-24 : | ********************** [mean = 21.9 +/- 6.1] |
| 25-30 : | ***************** [high = 30] |
Showing posts with label impulse. Show all posts
Showing posts with label impulse. Show all posts
20191021
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2019
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855
Exam code: quiz04JuR4
Sections 70854, 70855 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855
Exam code: quiz04JuR4
Sections 70854, 70855 results
20181023
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2018
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz04W3rK
Sections 70854, 70855 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz04W3rK
Sections 70854, 70855 results
| 0- 6 : | * [low = 3] |
| 7-12 : | ******** |
| 13-18 : | ************** |
| 19-24 : | ****************** [mean = 19.6 +/- 6.4] |
| 25-30 : | ********** [high = 30] |
20171031
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2017
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz04w33N
Sections 70854, 70855 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz04w33N
Sections 70854, 70855 results
| 0- 6 : | |
| 7-12 : | ***** [low = 9] |
| 13-18 : | **************** |
| 19-24 : | **************** [mean = 20.8 +/- 5.7] |
| 25-30 : | *********** [high = 30] |
20161025
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2016
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04th1R
Sections 70854, 70855, 73320 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04th1R
Sections 70854, 70855, 73320 results
| 0- 6 : | |
| 7-12 : | **** [low = 9] |
| 13-18 : | **************** |
| 19-24 : | *********************** [mean = 20.5 +/- 4.8] |
| 25-30 : | ******** [high = 27] |
20151031
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2015
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04w04K
Sections 70854, 70855, 73320 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04w04K
Sections 70854, 70855, 73320 results
| 0- 6 : | ** [low = 6] |
| 7-12 : | ******************* |
| 13-18 : | ************************ |
| 19-24 : | ****************************** [mean = 18.1 +/- 5.6] |
| 25-30 : | *** [high = 30] |
20141101
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2014
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04w3Rc
Sections 70854, 70855, 73320 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04w3Rc
Sections 70854, 70855, 73320 results
| 0- 6 : | **** [low = 3] |
| 7-12 : | ******** |
| 13-18 : | ****************** |
| 19-24 : | ************************ [mean = 19.5 +/- 6.6] |
| 25-30 : | *********** [high = 30] |
20131031
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2013
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04iSs5
Sections 70854, 70855, 73320 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz04iSs5
Sections 70854, 70855, 73320 results
| 0- 6 : | ** [low = 6] |
| 7-12 : | *********** |
| 13-18 : | ************************* [mean = 18.6 +/- 6.0] |
| 19-24 : | ****************** |
| 25-30 : | ********** [high = 30] |
20121025
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2012
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz04Bmw3
Sections 70854, 70855 results
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz04Bmw3
Sections 70854, 70855 results
| 0- 6 : | |
| 7-12 : | ******** [low = 9] |
| 13-18 : | ********** |
| 19-24 : | ****************** [mean = 21.3 +/- 6.0] |
| 25-30 : | **************** [high = 30] |
20111022
Physics quiz archive: energy conservation, momentum conservation
Physics 205A Quiz 4, fall semester 2011
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Sections 70854, 70855 results
Exam code: quiz04iMpL
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Sections 70854, 70855 results
Exam code: quiz04iMpL
0- 6 : ** [low = 6]
7-12 : *****
13-18 : ******************
19-24 : ****************** [mean = 19.4 +/- 5.5]
25-30 : ******** [high = 30]
20080402
Aftermarket after-accident airbag deployment
The SimpsonsEpisode 13 (413), Season 19
"The Debarted"
Screencaps from hulu.com
Well after Hans Moleman's car is hit from behind by Marge Simpson, its airbag deploys to comedic results. (As Hans' car appears to be an AMC Gremlin, would that airbag an aftermarket add-on?)
Related posts:
Physics clicker question: airbag effect
Airbags make babies cry
20071025
Physics clicker questions: kinetic energy-momentum sequence
Physics 5A, Fall Semester 2007
Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Problem 7.7
Students were asked the following clicker questions (Classroom Performance System, einstruction.com) near the beginning of their learning cycle:
Mass of (bowling?) ball = 5.0 kg
[0.6 participation points.] The ball is initially at rest, and then you push it such that it has a final speed of 3.0 m/s in the +x direction. What was the change in kinetic energy of the ball?
(A) –23 J.
(B) –15 J.
(C) 0 J.
(D) +15 J.
(E) +23 J.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 1 student
(B) : 1 student
(C) : 1 student
(D) : 9 students
(E) : 22 students
Correct answer: (E)
[0.6 participation points.] What was the change in momentum of the ball?
(A) –23 kg*m/s.
(B) –15 kg*m/s.
(C) 0 kg*m/s.
(D) +15 kg*m/s.
(E) +23 kg*m/s.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 0 students
(B) : 0 students
(C) : 0 students
(D) : 32 students
(E) : 2 students
(F) : 0 students
Correct answer: (D)
So far, so good--students seem to understand how to calculate changes in kinetic energy, and changes in momentum, especially when the initial velocity is zero.
Mass of (bowling) ball = 5.0 kg
[0.6 participation points.] The ball is moving with a speed of 3.0 m/s in the +x direction, and then hits a wall and bounces back with the same speed in the –x direction. What was the change in kinetic energy of the ball?
(A) –23 J.
(B) –15 J.
(C) 0 J.
(D) +15 J.
(E) +23 J.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 1 student
(B) : 2 students
(C) : 25 students
(D) : 0 students
(E) : 5 students
(F) : 0 students
Correct answer: (C)
The final and initial speed is the same, so there is no change in kinetic energy.
[0.6 participation points.] What was the change in momentum of the ball?
(A) –23 kg*m/s.
(B) –15 kg*m/s.
(C) 0 kg*m/s.
(D) +15 kg*m/s.
(E) +23 kg*m/s.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 27 student
(B) : 2 students
(C) : 5 students
(D) : 0 students
(E) : 0 students
(F) : 0 students
Correct answer: (A)
The final velocity is negative, and the initial velocity is positive, such that the change in momentum (the impulse) points in the -x direction. (Note that a negative change in kinetic energy corresponds to a decrease in speed; a negative change in momentum corresponds to the -x direction.)
Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Problem 7.7
Students were asked the following clicker questions (Classroom Performance System, einstruction.com) near the beginning of their learning cycle:
Mass of (bowling?) ball = 5.0 kg
[0.6 participation points.] The ball is initially at rest, and then you push it such that it has a final speed of 3.0 m/s in the +x direction. What was the change in kinetic energy of the ball?
(A) –23 J.
(B) –15 J.
(C) 0 J.
(D) +15 J.
(E) +23 J.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 1 student
(B) : 1 student
(C) : 1 student
(D) : 9 students
(E) : 22 students
Correct answer: (E)
[0.6 participation points.] What was the change in momentum of the ball?
(A) –23 kg*m/s.
(B) –15 kg*m/s.
(C) 0 kg*m/s.
(D) +15 kg*m/s.
(E) +23 kg*m/s.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 0 students
(B) : 0 students
(C) : 0 students
(D) : 32 students
(E) : 2 students
(F) : 0 students
Correct answer: (D)
So far, so good--students seem to understand how to calculate changes in kinetic energy, and changes in momentum, especially when the initial velocity is zero.
Mass of (bowling) ball = 5.0 kg
[0.6 participation points.] The ball is moving with a speed of 3.0 m/s in the +x direction, and then hits a wall and bounces back with the same speed in the –x direction. What was the change in kinetic energy of the ball?
(A) –23 J.
(B) –15 J.
(C) 0 J.
(D) +15 J.
(E) +23 J.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 1 student
(B) : 2 students
(C) : 25 students
(D) : 0 students
(E) : 5 students
(F) : 0 students
Correct answer: (C)
The final and initial speed is the same, so there is no change in kinetic energy.
[0.6 participation points.] What was the change in momentum of the ball?
(A) –23 kg*m/s.
(B) –15 kg*m/s.
(C) 0 kg*m/s.
(D) +15 kg*m/s.
(E) +23 kg*m/s.
(F) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 27 student
(B) : 2 students
(C) : 5 students
(D) : 0 students
(E) : 0 students
(F) : 0 students
Correct answer: (A)
The final velocity is negative, and the initial velocity is positive, such that the change in momentum (the impulse) points in the -x direction. (Note that a negative change in kinetic energy corresponds to a decrease in speed; a negative change in momentum corresponds to the -x direction.)
20071022
Physics clicker question: airbag effect
Physics 5A, Fall Semester 2007
Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Example 7.3
Students were asked the following clicker question (Classroom Performance System, einstruction.com) in the middle of their learning cycle:
[0.6 participation points.] An airbag (in conjunction with a seatbelt) will lessen the injuries caused by a car accident. How does the airbag do this, compared to wearing a seatbelt only?
(A) By decreasing the change in momentum.
(B) By decreasing the amount of impulse.
(C) By increasing the time duration of impact.
(D) (More than one of the above choices apply.)
(E) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 5 students
(B) : 5 students
(C) : 11 students
(D) : 14 students
(E) : 0 students
Correct answer: (C)
Assuming that the same type of accident is involved for the same mass occupant, the momentum change (m*(v_f - v_i) will be the same, as will be the impulse on the driver. The time duration (delta_t) for the impulse (F*delta_t) to be applied will be longer with the airbag, thus the force applied on the occupant will be lessened.
Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Example 7.3
Students were asked the following clicker question (Classroom Performance System, einstruction.com) in the middle of their learning cycle:
[0.6 participation points.] An airbag (in conjunction with a seatbelt) will lessen the injuries caused by a car accident. How does the airbag do this, compared to wearing a seatbelt only?
(A) By decreasing the change in momentum.
(B) By decreasing the amount of impulse.
(C) By increasing the time duration of impact.
(D) (More than one of the above choices apply.)
(E) (I'm lost, and don't know how to answer this.)
Sections 0906, 0907
(A) : 5 students
(B) : 5 students
(C) : 11 students
(D) : 14 students
(E) : 0 students
Correct answer: (C)
Assuming that the same type of accident is involved for the same mass occupant, the momentum change (m*(v_f - v_i) will be the same, as will be the impulse on the driver. The time duration (delta_t) for the impulse (F*delta_t) to be applied will be longer with the airbag, thus the force applied on the occupant will be lessened.
20071019
Airbags make babies cry
L: Ralph Nader and Toddler, (© UPI/Bettman)achievement.org
July 5, 1977
R: Ralph Nader and Toddler, unknown photographer
scienceservingsociety.com
July 5, 1977
Sure, airbags save lives, but do airbags make babies cry?
Two photos from the same event. Ralph Nader coaxing little Betsy into the airbag demonstrator, placing his finger over the airbag detonator.
"Watch out for that tree, Betsy! Watch out! Don't you see it? Betsy, what are you doing?!? BETSY..."
<INFLATE>Poof.</INFLATE>
A good 30 seconds passes before Betsy begins bawling her eyes out.
Well, that's the way it might have happened.
20071018
American crash-test dummies
Bizarro, by Dan Pirarowww.bizarro.com
March 30, 2007
Considering the same velocity change for a typical accident (v_f - v_i), a larger mass will require a greater impulse to come to a complete stop.
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