• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

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.

...read more.

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:

image01.jpg

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:

...read more.

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

...read more.

This student written piece of work is one of many that can be found in our AS and A Level Fields & Forces section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Fields & Forces essays

  1. Peer reviewed

    Investigating the forces acting on a trolley on a ramp

    5 star(s)

    = 10.941 (3d.p.) However using the minimum possible value of � (0.029679 - 0.008729); g = 1.6373 / (sin 10.8 - (0.02095 x cos 10.8)) = 9.816 (3d.p.) Obviously then, at smaller angles, the percentage uncertainty is much larger. Therefore it is also appropriate to say that at larger angles, the percentage uncertainty is lower.

  2. Objective To find the acceleration due to gravity by means of a simple ...

    It is a kind of reading error caused by scale uncertainty. 3. As the value for g is obtained solely from the slope of the graph it follows that the % error in g is the same as the % error in the slope.

  1. Investigating a factor affecting the voltage output of a transformer.

    * I will carry out the experiment on clear work surfaces, away from bench edges, and away from any water. Standardisation/Fair Test As well as keeping all the variables listed under 'Variables' constant (except for primary voltage of course), in particular the number of turns on the primary and secondary

  2. Maths Statistics Investigation - To Find the Quality of Players Playing Rugby for Malvern ...

    There are 8 players who have all played first team rugby during the first 6 games of the 2000 season compared to the next largest grouping of players in one house, number two, which only has 5. For this reason I predict that number one will win the house competition,

  1. Investigating the Mechanics of the 100 Metre Sprint.

    Assumption being made:cofe fer sefefew orfe fek infe fofe fe. * Total time 17.5 seconds * A distance of 100 metres * No air resistance * Straight track field * Start at rest * / = Divide * ms-1 = meter per second Since I am doing this investigation, I run a 100-metre race to experience by myself.

  2. To Find the Quality of Players Playing Rugby for Malvern College 1st XV.

    against Total time spent on pitch (x axis), I will be able to draw a scatter graph, and be able to rate any player in a similar way to that in which the Coach rates any individual by using the formula y = mx +c.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work