28 Sep Which students did you peer-review for the tutorial and/or lab?

Question 1You should do this question in your second quiz submission (it is not necessary to do it in your first submission). This question is #1 in the quiz for ease of grading. It is really meant to be done as the last thing you do in the week!

 

1.      Which students did you peer-review for the tutorial and/or lab? Please write their names (go back to check).  What did you learn from helping your peers? Or write something you found interesting and/or useful. This is a good opportunity to reflect on your work, a very useful learning tool.

 

2.      What was the muddiest point this week? What was most unclear in the physics content? A good learning strategy is to identify each week the material that you will need to practice more.

 

3.      Which (physics) question of this quiz was the hardest? What learning objective is that question mostly about

 

The learning objectives for Quiz 2, week 2 are 

 

·         LOPro02 use proportional reasoning to analyze relationships

 

·         LOPro04 critique proposed analyses of physical situations

 

·         LOPro05 differentiate and integrate polynomial functions

 

·         LOKin02 understand & differentiate between average and instantaneous quantities

 

·         LOKin03 distinguish & relate position, velocity and acceleration using slopes/derivatives and areas/integrals of functions with respect to time

 

·         LOKin04 relate and create time dependent plots of kinematic variables

 

Notes:  For part 1, if you were not able to do peer-reviews, just say so. You will lose points (this question is how we grade peer-reviews) even if the reason you were not able to do peer-reviews is because you submitted your draft late. This is only place where you lose point for submitting a late tutorial.

 

Question 2An object moves in one dimension with a velocity of (4m/s) – (4m/s2) t. Its position at time t=0 is x=2m. At what time does the object come to rest?

 

Group of answer choices

 

2 s

 

4 s

 

−1 s

 

1 s

 

0 s

 

Question 3The graph above gives the velocity versus time for some object. Which of the graphs below, of position versus time, is consistent with this graph?

 

 Group of answer choices

 

(b)

 

(a)

 

(d)

 

(e)

 

(c)

 

Question 4This figure shows an object’s position vs. time.

 

Question 5A car is traveling at 12 m/s between t = 0 s and t = 2 s. At t = 2 s, the driver sees a red light ahead and steps on the brakes. The car’s acceleration has a magnitude of 3 m/s2; the car eventually comes to rest at the traffic light. How far has the car traveled since t = 0 s?

 

Group of answer choices

 

72 m

 

56 m

 

24 m

 

48 m

 

36 m

 

Question 6An absent-minded Penn State professor drives from State College to Tyrone, 20 miles away, at 60 mph (miles per hour), before realizing that he forgot his wallet. He immediately returns to State College at 60 mph, picks up his wallet and drives back to Tyrone at 60 mph. Assuming all the travel was done more or less on a straight line and neglecting the time taken to turn around or collect the professor’s wallet, what is the magnitude of the professor’s average velocity for the entire trip?

 

10 mph

 

20 mph

 

0 mph

 

1 mile per minute

 

60 mph

 

Question 7A very low friction IOLab cart is launched at t=0 at initial speed vi up a track that is angled upward relative to the horizontal. The wheel sensor is used to record the velocity of the IOLAB along the ramp, where down the ramp is defined as the positive direction. Which of the following graphs could represent the velocity of the IOLAB as a function of time?

 

Question 8 Rock 1 is dropped from height h and rock 2 is dropped from height 2h above a river. What is the ratio of their velocity just before they hit the river.