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To find out how accurate a stop clock, ticker timer and light gate are, and therefore how precise my work is.

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Introduction

24/09/01

Accuracy and Precision

by Emma Walters

Aim:

To find out how accurate a stop clock, ticker timer and light gate are, and therefore how precise my work is.

Definitions:

Accurate – free from error

Precise – exact; correct and clearly stated  

Apparatus:

  • Trolley

  • Runway
  • Blocks
  • Stop clock
  • Ticker timer
  • Tick tape
  • Power pack
  • Meter rule
  • Light Gate
  • Cardboard
  • Balance

Diagram:

Method:

  1. Collect and set up apparatus.
  2. Weigh trolley, record.
  3. Raise runway to 15cm high.
  4. Measure 1.00m on runway.
  5. Place Trolley at top of runway.
  6. Release trolley and start Stop clock.
  7. Stop clock when trolley past 1.00m.
  8. Repeat 3 times and record results.
  9. Attach 1.00m length of ticker tape to back of trolley.
  10. Turn ticker timer on and release trolley.
  11. Repeat 3 times and record results.
  12. Tape piece of card to top of trolley, and reweigh trolley, record.
  13. Turn light gate on, make sure 1.00m apart.
...read more.

Middle

(N)

Stop clock

1.8

1.9

1.9

1.9

0.783

1.00

0.53

1.1

0.28

0.227

Ticker timer

1.7

2.0

2.2

2.0

0.783

1.00

0.51

1.0

0.26

0.203

Light Gate

1.74

1.72

1.70

1.72

0.811

1.00

0.58

1.2

0.34

0.276

Formulae used:

  • S = d/t

  • V max = 2V
  • F = m a
  • a = (V - u)/t
  • T avg = (T1 + T2 + T3)/3

Calculations:

S = d/t

...read more.

Conclusion

1/100th of a second.  Making it more precise as well.

Evaluation:

Overall I think that this experiment went quite well.  The times that we got were fairly accurate, and they were not that far apart.  If I had to do this experiment again, I would change a few things that I did.  I would try to do all the experiments at once, so that if something affects one thing, it should affect them all, and you would be able to see how accurate or inaccurate the results were, as they should all be the same.

...read more.

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