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phy lab. lab report his is an explanation of Phy lab about projectile motion in which we disuceed how to make graph and use the datain the graph, Lab Reports of Physics

Harper CollegePhysics

lab report his is an explanation of Phy lab about projectile motion in which we disuceed how to make graph and use the datain the graph

Typology: Lab Reports

2019/2020

Uploaded on 10/01/2020

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chris-patel 🇺🇸

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Experimental Errors: What Are They Exactly and Why Do We Care About Them?
Rev. 8/20/20 DLD 1 LAB
Objectives To determine why an understanding of experimental error is important
To identify and classify experimental errors
To determine the impact experimental errors have on data and results
To propose ways to mitigate experimental errors
Equipment A computer with internet access
A metric measuring tape or ruler
12 pens
Investigation 1: Data Collection and Analysis
1. Locate 12 pens. Using the measuring tape in your lab kit or a metric ruler, measure the length of
each pen (in centimeters) and record the data in Table 1.
2. Determine the mean experimental length of a pen. Show all of your calculations in the space
indicated.
3. Determine the standard deviation of the mean length of a pen. Show all of your calculations in
the space indicated.
4. The mean length of a pen, as specified by the pen industry, is 18.00cm. How does your mean
value compare to the value given by industry? What quantity should you calculate to
demonstrate this comparison and why? Answer the question and show all of your calculations in
the space indicated.
Table 1: Measurements of Pen Length
Pen Number
Pen Length (cm)
1
2
3
4
5
6
7
8
9
10
11
12
Calculation of the mean pen length:
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IEffi 1hr51 tIM53 t1hr51 t16.00 t16.10
t16.05 ntIM02 tIHOO
12
17,8298L lm91Cm
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14.51!
14.53!
14.51!
16.00!
16.10!
16.05!
15.00!
15.12!
15.10!
14.00!
14.02!
14.00
Chris Patel
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Download phy lab. lab report his is an explanation of Phy lab about projectile motion in which we disuceed how to make graph and use the datain the graph and more Lab Reports Physics in PDF only on Docsity!

Experimental Errors: What Are They Exactly and Why Do We Care About Them?

Rev. 8/20/20 DLD 1 LAB Objectives To determine why an understanding of experimental error is important To identify and classify experimental errors To determine the impact experimental errors have on data and results To propose ways to mitigate experimental errors Equipment A computer with internet access A metric measuring tape or ruler 12 pens Investigation 1: Data Collection and Analysis

  1. Locate 12 pens. Using the measuring tape in your lab kit or a metric ruler, measure the length of each pen (in centimeters) and record the data in Table 1.
  2. Determine the mean experimental length of a pen. Show all of your calculations in the space indicated.
  3. Determine the standard deviation of the mean length of a pen. Show all of your calculations in the space indicated.
  4. The mean length of a pen, as specified by the pen industry, is 18.00cm. How does your mean value compare to the value given by industry? What quantity should you calculate to demonstrate this comparison and why? Answer the question and show all of your calculations in the space indicated. Table 1: Measurements of Pen Length Pen Number Pen Length (cm) 1 2 3 4 5 6 7 8 9 10 11 12 Calculation of the mean pen length: I Effi 1hr51 t^ IM 53 t^ 1hr51^ t^ 16.00^ t^ 16. t 16.05 n^ t IM 02 t IHOO 12 17,8298L lm91Cm

Chris Patel

Experimental Errors: What Are They Exactly and Why Do We Care About Them?

Rev. 8/20/20 DLD 2 LAB Calculation of the standard deviation of the mean pen length: Comparison of the mean pen length to the industry standard: Explanation of the choice of calculation:

5 fEC

2 N (^) I

y

tm s

inoo in.ae t 1h02 (^) 1hr

12 1 Oμg22T

Industry standard^ 18.00cm

mean the91cm 11hr91 (^) 18.00cm 91004 17.1ft 18.00cm The mean value is different than their industry standard that is 18.00 cm. The mean that I found is 14.91 cm. This is difference of 3.09 cm. This also indicates that the percent error is of about 17.16% from the industry standard.

Description errors : - Types of Errors:- Error Influenced:- Suggestion:- 1.) The air resistance plays an important role in the slowing of the ball. The edžperiment didn͛t talk about the air resistance 1.) Systematic Errors 1.) Air resistance errors can happen when the lab reports are read carefully. This type of errors may also be caused by the lab being done in a hurry and not being checked twice before submitting. 1.). Avoid human error in calculation and pressing start and stop on the timer 2.) Errors also occurs when we round the numbers instead of counting it as it shows on the calculator. Rounding gives us the near value of the nearest tenth or hundredth but not the accurate value. 2.) Random Errors 2.). Rounds Errors are common. This type of errors are influenced by the habit ion rounding the units, and can also be lead by making up the measurements when the edžperiments don͛t goes as planed 2.). Take into consideration of the air resistance that makes the flow of the ball slower. 3.) The human errors that occurs when managing the timer. Start and stop when the ball touched the table and when it touched the ground may differ from person to person. 3.) Systematic Error/ Human Error 3.). This are the errors in the timer may occur because of the nit reading the numbers/ time carefully and predicting the time rather than putting actual time on the calculation. 3.). Taking precision timing on the timer and counting very second in the timer, rather than predicting the time. 4.) rolling the ball in some speed instead of stationary ball being released. 4.) Systematic Error 4.) This errors are influenced by the not paying attention on the lab and trying to completed the lab faster than it suppose to be done. 4.). Following the lab rules and performing the lab as it was intended to do. 5.) The uneven surface on the table that leads to the ball rolling fast or slow. 5.) systematic error 5.) this error may happen when there is no checking of the level of the table being balanced. 5.) Balance the table by adding something on the table or even changing the table with more even surfaces. INVESTIGATION:- 2

Description errors: - Types of Errors: - Error Influenced:- Suggestion: - 1.) there are errors in the acceleration. 1.) Systematic Errors 1.) Taking too many ǀale͛s into coƵnting͘ 1.) Take appropriate amount of the value into the calculation that decreases the marginal errors. 2.) Errors in the free falling ball. The ball wobbles in the air before it hits the plate. 2.). Random Errors 2.) Carelessly adjusting the ruler and the magnet on the side and the on the top respectively. 2.) Adjust the ruler and the magnetic steel ball properly. 3.) The difference in the value to the standard value is expected due the experiment not being conducted in the vacuum. 3.) Systematic Error 3.) Discarding the Increasing velocity of the ball. 3.) Check the ruler twice before performing the lab. 4.) Personal errors may also have being associated with the instrument which may have affected the result of the process 4.) Random Error 4.) Not taking into consideration of the negative height in the calculation. 4.) While calculation take the increasing the speed of the ball into consideration. 5.) More reading were taken which leads up to more variations and errors and. The difference in the value. 5.) Random Error 5.) Getting distracted into performing the lab 5.) Remembered the negative weight of the ball as it os being released from top to the bottom. INVESTIGATION:- 3