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# Quality of Measurement - Physics AS

Extracts from this document...

Introduction

Quality of Measurement

Aim:

For my experiment I am going to be investigating gravity by freefall by dropping a ball bearing onto a micro switch (pressure pad) from different heights and recording the time taken for it to land.

Plan:

I have chosen to measure gravity by freefall using a range of apparatus. I decided to use timing electronics linked to a micro switch pad with a ball bearing release mechanism to provide the most accurate results possible.

I am going to achieve my aim by having a ball bearing in between two metal plates and when the potential difference is lost between the two plates (when ball is dropped) the timer will begin until the pressure pad is hit.

Accuracy is key in getting the correct results, I need to be working towards proving that g = 9.81… metres per second. I am going to give room for error by taking

+/- 0.1cm for the dropping height as well as maintaining the time to 3dp.

I am going to drop my ball bearing from heights ranging from 100cm – 10cm in increments of 10cm +/- 0.

Middle

90cm

0.38s

0.072

80cm

0.34s

0.058

70cm

0.30s

0.045

60cm

0.26s

0.034

50cm

0.22s

0.024

40cm

0.16s

0.013

30cm

0.12s

0.007

20cm

0.10s

0.005

10cm

0.06s

0.002

Here are the averages of the results I got for the ticker tape experiment after I had all the data there I still had some work to do yet which was working out “g”

Apparatus:

• Retort Stand
• Timing Electronics
• Wires
• Boss
• Clamp
• Ball Release Mechanism
• Micro switch (Pressure Pad)

Diagram:

Method:

1. Set up apparatus as show above so the ball releasing mechanism is directly above the micro switch and test the circuit to check that it works correctly
2. Pull the micro switch up to reset it and then insert the ball bearing into the release mechanism.
3. Set the height of the release mechanism to desired distance
4. Release the ball bearing so that it strikes the pressure pad and record the time take to fall
5. Repeat step 4 until you have a three similar results for that distance
6. Then repeat step 3 onwards until all the heights have been completed and recorded
 Height (cm) +/- 0.1cm Average +/- 0.0005s ½t² 100cm 0.442 s 0.0975 90cm 0.421 s 0.0885 80cm 0.390 s 0.0760 70cm 0.360 s 0.0640 60cm 0.336 s 0.0564 50cm 0.310 s 0.0480 40cm 0.276 s 0.0380 30cm 0.231 s 0.0267 20cm 0.192 s 0.0184 10cm 0.135 s 0.0091

Safety:

Conclusion

47.5

G =  0.0483 = 9.83ms-²

Although you also have to take into account the +/- 0.1cm distance fallen you can clearly see the range of error for “g” is:

47.4    47.5

G =   0.0483   ←→    0.0483

Having g range from

G = 9.813 ←→ 9.855

As you can see taking into account +/- 0.1cm makes a real difference to the results helping you get a more clear view of what the possibilities so it is clear whether the test has had anomalies along the way.

Fitness For Purpose

As you can see from the analysis I was able to accurate plot “g” by freefall even more this proved that the system I used to find “g” in my experiment was well suited for the task in hand.  I also thought that the task used relates well to everyday surroundings as gravity takes a big part.

From the experiments I did you can clearly see that the system I finally used to plot my analysis is well suited to the degree of accuracy needed for something like this. With a difference in the experiments using the ticker time and having “g” =         and in my experiment involving the timing electronics where “g” = 9.83ms-²

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