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lab 1 measurements physics

Figure #1 : Pendulum PROCEDURE: and record their actual masses in the data table below 1. Weigh the 500g and 200g masses Table # 1: Mass values Nominal Mass Value 200g Ratio of masses: Actual Mass Value 50D Nominally: 5/2-2.5 Actual Keep this ratio in mind as we do the experiment to see if it affects our values 2. Attach the 500g mass to the line and attach it to the holder such that the length from the holder connection to the c.g. of the mass is 75cm. This length is important. Be as accurate as you can be. Get down on the floor if necessary to have your eyes be level with the meter stick and mass. Now the question YOU have to answer to yourself is Where is the c.g.cf mass? It usually near the middle of the mass. Put a pencil mark where you think it is (for future use) and proceed Now, with 1 student using the stopwatch (practice starting and stopping the watch several times so that you can do it without thinking about it) and another holding the mass to the side (THE BOTTOM OF THE MASS BEING NO MORE THAN 7 CM FROM THE VERTICAL LINE), release the mass and start the stopwatch simultaneously. Practice once or twice so that you synchronize yourselves. How are you going to be able to determine that you are no more than 7 cm? 3. Mr. Giasomo Experiment #1 (Rev 12019) ics 107

4. Count out 10 full swings, back and forth, to and fro, and when the mass returns to its highest position on the 10th swing, stop the stopwatch. Enter the value in the table below this two (2) more times, entering the data when you finish. Make sure you displace the mass the same distance as you did before. Table #2 Period of 75cm pendulum with 500g mass with 7 cm displacement Trial # (500g mass) Time of 10 swings for 500g mass Average period of Trial ес 150% Sec 71 SeC Average Period of AlIl 3 Trials e C 1.701 se 6. Your periods may vary from trial to trial. Since, all physical aspects of the pendulum (mss, length, displacement, gravity) were the same, what must you assume is the major source of this difference (called error, even though it is not necessarily a mistake)? Do you think the amount of displacement (the 7 cm you measured from the vertical) can affect the period? 7. Repeat the 10 swings three more time at the 75.0 em length, but displace the mass from vertical only 3 em at release. Record your answer below 8. Table #3 Period of 75cm pendulum with 500g mass with 3 crn displacement Time of 10 swings fr S00g mass s) Average period offrial Time/10,s) Trial # (500g mass) | | Average Period of All 3 Trials ,7Sec From this measurement, did changing the displacement amount from vertical effect the period significantly, say >5% ? Calculate the difference and make a determination. (90 diff lval#2-val#11/val#1 x 10096) 9. Mr. Giasomo Experiment #1 (Rev I/2019)
MacBook Pro or lengthen) to increase the swing? Guess! Do net period 1a What do you think you need to do to the length (shorten or len of the pendulum, i.e., make it take a longer time to e string length to 50 if you chose shorten or increasing to 100 em ir you chose lengthen) and repeat and calculate renew 11. Chock your answer by either decreasing the string lensth to measuring the time for 10 pencil mark on the mass as the c.g. reference Table #4 Period of S00g mass with new pendulum length of Pendulum Time of 10 Swings (s) New Period (Time 10) (s) 12. Was your guess correct? If not, what should you have done? 13. We have changed the length of the pendulum, the displacement of the swing, but not yet the mass 14. Attach the 200g mass to the cord and attach it to the stand such that the length from attachment to your estimate of where the c.g. is, is 75.0 cm. Repeat the 10 swings for 3 trials and record the time and calculate the average period. Use a 7 cm displacement. This will keep the angle of displacement the same. Table#5 Period of 75cm pendulum with 200g mass with 7 cm displacement Trial # (200g mass) Time of 10 swings for 200g mass | Average period of Trial Time/10, s) Average Period of All 3 Trials Mr Giasomo Experiment #1 (Rev 12019) Physics 107

SUMMARY: In Part I write a short summary (complete sentences and be and explain what factors affect the period of a pendulum and, hence, what measurements would need to be taken. In Part 2, list the various sources of error (in measuring) that you encountered which affect your being able to get an exact and repeatable value for the period. legible) itemize PART 1: Factors affecting the period of the pendulum. PART 2: Sources of error affecting the values of the measure.
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