Question

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

Answer 1

When I displace the mass I have to measure the distance from the bottom most position theta = 35 degree the angle with the vertical should not be more than 5 it is easily measurable with the help of protection from s = r theta = 7/75 = 0.093 rad = 0.093 times 180/0 = 5.35 degree G.rad = 180 1 rad = 180/9 degree in this max line major source of error is during observation of lime amount of displacement will not affect line time period of the displacement is within 10 but above that displacement will affect time period percentage difference = 1.707..7/1.707 times 100% = 0.41% to increase the period the length of the string should be increased from table T = 1.89 whereas before T was 1.7 sec = so guess was correct factors affecting time period (i) length of the string (ii) acceleration due to gravity T = 2 pi squareroot L/g part 2 sources of error (i) error is observing time (ii) displacement more than 10 mass of the string twisting motion of string