course Phy 201 assignment #000000. `Query 0
......!!!!!!!!...................................
20:18:30 `questionNumber 0 The Query program normally asks you questions about assigned problems and class notes, in question-answer-self-critique format. Since Assignments 0 and 1 consist mostly of lab-related activities, most of the questions on these queries will be related to your labs and will be in open-ended in form, without given solutions, and will not require self-critique. The purpose of this Query is to gauge your understanding of some basic ideas about motion and timing, and some procedures to be used throughout the course in analyzing our observations. Answer these questions to the best of your ability. If you encounter difficulties, the instructor's response to this first Query will be designed to help you clarify anything you don't understand. {}{}Respond by stating the purpose of this first Query, as you currently understand it.
......!!!!!!!!...................................
RESPONSE --> This query consists of questions related to labs and will not have solutions. This query is to determine if I understand motion and timing
.................................................
......!!!!!!!!...................................
20:22:18 `questionNumber 0 If, as in the object-down-an-incline experiment, you know the distance an object rolls down an incline and the time required, explain how you will use this information to find the object 's average speed on the incline.
......!!!!!!!!...................................
RESPONSE --> Since you know the distance / and the time, you can simply convert this fraction by a simple conversion. Giving you the average speed in meters/ second. confidence assessment: 2
.................................................
......!!!!!!!!...................................
20:26:07 `questionNumber 0 If an object travels 40 centimeters down an incline in 5 seconds then what is its average velocity on the incline? Explain how your answer is connected to your experience.
......!!!!!!!!...................................
RESPONSE --> 40/5= 8 cm/s I did this same calcuation in the experiment when I was trying to determine if the object was speeding up. confidence assessment: 3
.................................................
......!!!!!!!!...................................
20:32:14 `questionNumber 0 If the same object requires 3 second to reach the halfway point, what is its average velocity on the first half of the incline and what is its average velocity on the second half?
......!!!!!!!!...................................
RESPONSE --> Since the book was 40 cm, the halfway point would be at 20 cm. Thus the halfway point would have an average velocity of 20/3 = 6.667 cm/s. The average velocity on the second half would be 8 cm/s - 6.667 cm/s = 1.333 cm/s. confidence assessment: 2
.................................................
......!!!!!!!!...................................
20:39:34 `questionNumber 0 Using the same type of setup you used for the first object-down-an-incline lab, if the computer timer indicates that on five trials the times of an object down an incline are 2.42 sec, 2.56 sec, 2.38 sec, 2.47 sec and 2.31 sec, then to what extent do you think the discrepancies could be explained by each of thefollowing: {}{}a. The lack of precision of the TIMER program{}{}b. The uncertain precision of human triggering (uncertainty associated with an actual human finger on a computer mouse){}{}c. Actual differences in the time required for the object to travel the same distance.{}{}d. Differences in positioningthe object prior to release.{}{}e. Human uncertainty in observing exactly when the object reached the end of the incline.
......!!!!!!!!...................................
RESPONSE --> a. The precision of the TIMER program was not very good. Most measurements varied by 0.1 or greater. b. This precision error could very well be contributed by the fact that it was human error in the ability to hit the mouse at the same time every time. c.The time it took the object to travel down the book could have been affected by a slight breeze that may speed up or slow down the object. d. Human error could also occur if the object was positioned a few centimeters up or down each time the object was released. e. The object may have been stopped earlier or later at the end of the incline, this due to human error. confidence assessment: 3
.................................................
......!!!!!!!!...................................
20:45:30 `questionNumber 0 How much uncertainty do you think each of the following would actually contribute to the uncertainty in timing a number of trials for the object-down-an-incline lab? {}{}a. The lack of precision of the TIMER program{}{}b. The uncertain precision of human triggering (uncertainty associated bLine$(lineCount) =with an actual human finger on a computer mouse){}{}c. Actual differences in the time required for the object to travel the same distance.{}{}d. Differences in positioning the object prior to release.{}{}e. Human uncertainty in observing exactly when the object reached the end of the incline.
......!!!!!!!!...................................
RESPONSE --> a. The TIMER should be the most reliable tool used in the experiment. Since most instruments are calibrated to give the best results possible. b. Human triggering is unreliable as it is very difficult to move the mouse at the same time, mulitple times. c. Differences in the times are usually due to human error. This may be beginning or stopping the timer too soon. Or even releasing and catching the object too soon or too late. d. Positioning could cause uncertainty. However, if you are accurate in where you lay down the object this should not pose a big problem. e. Once again, if you are accurate in your measurements of where you stop the object, this should not be a place to see much uncertainty. confidence assessment: 3
.................................................
......!!!!!!!!...................................
20:58:05 `questionNumber 0 What, if anything, could you do about the uncertainty due to each of the following? Address each specifically. {}{}a. The lack of precision of the TIMER program{}{}b. The uncertain precision of human triggering (uncertainty associated with an actual human finger on a computer mouse){}{}c. Actualdifferences in the time required for the object to travel the same distance.{}{}d. Differences in positioning the object prior to release.{}{}e. Human uncertainty in observing exactly when the object reached the end of the incline.
......!!!!!!!!...................................
RESPONSE --> a. The TIMER program could be calibated to .001 of each tap of the mouse. b. You could count on a stop watch and hit the trigger at a certain second each time. c. You could do a larger number of trials to get a better average difference. d. Measurements should be taken each time in order to make sure you release the object at the same point each trial. e. Human error can occur if you are unable to see exactly when the object reached the end of the incline. However, in the future students may put something at the bottom of the book to stop the object. This way the timer can be stopped as soon as the object hits the barrier at the bottom. confidence assessment: 3
.................................................
......!!!!!!!!...................................
21:03:40 `questionNumber 0 According to the results of your introductory pendulum experiment, do you think doubling the length of the pendulum will result in half the frequency (frequency can be thought of as the number of cycles per minute), more than half or less than half?
......!!!!!!!!...................................
RESPONSE --> From my results as the pendulum got larger, the frequency got smaller. However, the frequency was not decreased by half only decreased around 1/4th. confidence assessment: 3
.................................................
......!!!!!!!!...................................
21:07:29 `questionNumber 0 Note that for a graph of y vs. x, a point on the x axis has y coordinate zero and a point on the y axis has x coordinate zero. In your own words explain why this is so.
......!!!!!!!!...................................
RESPONSE --> The x and y axes are perpendicular to each other. Thus if a point falls on the x axis, the y coordinate is zero and vice versa. confidence assessment: 3
.................................................
......!!!!!!!!...................................
21:11:15 `questionNumber 0 On a graph of frequency vs. pendulum length (where frequency is on the vertical axis and length on the horizontal), what would it mean for the graph to intersect the vertical axis (i.e., what would it mean, in terms of the pendulum and its behavior, if the line or curve representing frequency vs. length goes through the vertical axis)? What would this tell you about the length and frequency of the pendulum?
......!!!!!!!!...................................
RESPONSE --> It would mean that the Length of the pendulum was a negative number. confidence assessment: 1
.................................................
......!!!!!!!!...................................
21:12:23 `questionNumber 0 On a graph of frequency vs. pendulum length, what would it mean for the graph to intersect the horizontal axis (i.e., what would it mean, in terms of the pendulum and its behavior, if the line or curve representing frequency vs. length goes through the horizontal axis)? What would this tell you about the length and frequency of the pendulum?
......!!!!!!!!...................................
RESPONSE --> It would mean the frequency was a negative number. confidence assessment: 1
.................................................
......!!!!!!!!...................................
21:15:40 `questionNumber 0 If a ball rolls down between two points with an average velocity of 6 cm / sec, and if it takes 5 sec between the points, then how far apart are the points?
......!!!!!!!!...................................
RESPONSE --> x cm/ 5 sec = 6 cm/s x = 30 cm confidence assessment: 3
.................................................
......!!!!!!!!...................................
21:16:44 `questionNumber 0 On the average the ball moves 6 centimeters every second, so in 5 seconds it will move 30 cm. {}{}The formal calculation goes like this: {}{}We know that vAve = `ds / `dt, where vAve is ave velocity, `ds is displacement and `dt is the time interval. {}It follows by algebraic rearrangement that `ds = vAve * `dt.{}We are told that vAve = 6 cm / sec and `dt = 5 sec. It therefore follows that{}{}`ds = 6 cm / sec * 5 sec = 30 (cm / sec) * sec = 30 cm.{}{}The details of the algebraic rearrangement are asfollows:{}{}vAve = `ds / `dt. We multiply both sides of the equation by `dt:{}vAve * `dt = `ds / `dt * `dt. We simplify to obtain{}vAve * `dt = `ds, which we then write as{}`ds = vAve *`dt.{}{}Be sure to address anything you do not fully understand in your self-critique.
......!!!!!!!!...................................
RESPONSE --> I understand. self critique assessment: 3
.................................................
......!!!!!!!!...................................
21:19:56 `questionNumber 0 You were asked to read the text and some of the problems at the end of the section. Tell me about something in the text you understood up to a point but didn't understand fully. Explain what you did understand, and ask the best question you can about what you didn't understand.
......!!!!!!!!...................................
RESPONSE --> Chapter one was easy for me to understand. I really do not have any questions. However, I always have trouble with significant figures. Do you count off on tests if the sig figs are not correct? confidence assessment: 3
.................................................
......!!!!!!!!...................................
21:20:54 `questionNumber 0 Tell me about something in the problems you understand up to a point but don't fully understand. Explain what you did understand, and ask the best question you can about what you didn't understand.
......!!!!!!!!...................................
RESPONSE --> Once again, I did well on all of the problems. Just still having some trouble on determining sig figs. confidence assessment: 3"