THIS IS THE LINK https://phet.colorado.edu/sims/html/masses-and-springs-basics/latest/masses-and-springs-basics_en.html , PLEASE DO THIS ACTIVITY ON A COMPUTER GO TO THE WEBSITE LINK THAT I PUT THE SAME LINK UNDER MATERIALS PLEASE COPY THE LINK ON YOUR COMPUTER TO DO THE EXCERSICES, THANK YOU.

Objective: In this lab exercise we will be discussing measurement accuracy and precision, significant figures, and scientific notation. The notion of measurement accuracy and precision is essential to properly communicating results of a measurement and the final uncertainty in a measurement can be no better than the measurement with the lowest level of accuracy. For example, if you know you are traveling, in a car, at exactly 65 miles per hour for exactly 1 hour. Then you know you traveled exactly 65 miles. However, there is actually uncertainty in the measurement. In practice if you claim you are traveling 65 miles per hour as read on a speedometer with 1 mile per hour resolution then convention states you are traveling 65 1 1 mph. Similarly, if your watch has resolution of only 1 second then you know your travel time is 1 hr 1 1 sec which we can rewrite as 1 0.0003 hrs. This would be the most accurate way to express the uncertainty. But we might just choose to write out that we traveled for 1.000 hrs where we chose to round to 4 significant figures. It should be clear in this case the more significant uncertainty in the determination of how far you actually drove in the hour is the speed at which you are traveling. Therefore, one can not claim a distance traveled better than the uncertainty in the speed. That is to say when you multiply (65 mph x 1.000 hrs = 65 miles) you can't claim you drove 65.000 miles since the uncertainty is dominated by the resolution of the speedometer. In this lab exercise we will first complete a worksheet involving measuring the length of an object using the rulers supplied in this handout. We will then perform an exercise involving accuracy versus precision, followed by a few exercises related to expressing numbers using scientific notation and performing relatively simple calculations concentrating on making sure to express the final answer with the correct significant figures. Finally, you will be running a simulation to determine the spring constant of a spring using several different methods. The formulas to determine the spring constant are given to you in this handout. Your job will be to perform the measurements and also determine which method leads to the most accurate result and why.Materials: This handout, printed . A pencil or pen with length -15 cm (6 inches). Don't worry about being very close to this length, a common pencil or pen is between 14 and 16 cm. Attendance or viewing mini-lecture on significant figures and scientific notation. Computer and Internet access to use the following simulation: https://phet.colorado.edu/sims/html/masses-and-springs-basics/latest/masses-and-springs- basics en.html Investigation A: Resolution of a Ruler Purpose: To understand that the resolution of a measurement device determines how precise of a measurement you can make.to start the timer. At the end of 1 cycle click the stop button. This will give you the time for the system to complete one cycle which is the definition of the period. Repeat this 10 times filling in the table below. Note that even though the stopwatch reads out to 0.01 seconds, the average person's reaction time is only about 0.2 seconds. Therefore, you should round your number to only round your measurement to the nearest 01 seconds. Trial # Period (3) Spring Constant (1:) Measured Sig Figs. Calculated Sig Figs. 10 AverageQ1) Of the two ways you have measured the spring constant thus far which way do think is most accurate? Explain. Q2) Can you name any sources of systematic errors in the above measurement that would result in a lack of accuracy versus lack of precision in each individual measurement? Q3) Does the exercise of averaging several measurement's reduce the impact of systematic error in each measurement?5) Finally, we are going to measure the spring constant by measuring the period of oscillation again. But this time we are going measure the time it take for the spring mass system to complete many oscillations which should reduce both random error as well as systematic error. a. Using the 250g mass again Repeat step 4 above (Only 1 additional trial) but this time keep the timer running until 100 cycles are completed and stop the timer as close as possible to 100 complete cycles. This will give you the total time for 100 cycles which if you divide by 100 gives you the period of oscillation. Given the reaction time is still on the order of 0.2 seconds this will give you - 100 fold improvement in the measurement of the period. Record your measurements and revised calculation of the spring constant below. Time For 100 cycles: Period of oscillation: Spring Constant: Q4) Which of the 3 calculated values for the spring constant do you think is most accurate? Explain