Physics Practical 2
Measurement
Objective
To calculate the volume of a wooden
block
To measure the internal and external
diameter of a test tube
To measur...
Apparatus Used
Ruler
Wooden block
Vernier Caliper
Test tube
Micrometer screwgauge
Copper wire
Procedure
Wooden Block
1. Place the block onto
the zero mark of the
ruler.
2. Place block in front
of the eye level.
3. Take the rea...
Wooden Block
4. Repeat step 1,2 and
3 for the width and
the breadth.
5. Record the
measurements in the
same table of resul...
Copper Wire
1. Check for zero error
by turning thimble
to close the anvil
2. Note and record the
error. (error = -0.01
mm)...
Copper Wire
3. Turn the thimble so
that the anvil can fit
the wire.
4. Place the wire in
between the anvil.
5. Turn the th...
Copper Wire (Thick)
6. Read the main scale
and the thimble
scale.
7. Record the reading
in a table of results.
8. Repeat s...
Copper Wire (Thin)
9. Repeat steps 1-8 for
the thin wire.
Boiling Tube
1. Check for zero error
by closing the jaws
together. (error = 0
cm)
Boiling Tube
2. Open the jaws and
place the boiling tube
in between.
3. Close the jaws gently
until it touches the
side of...
Boiling Tube
4. Read the scales and
record the values in a
table.
Boiling Tube
5. Repeat steps 1-4 for
the external
diameter.
Boiling Tube
6. Repeat steps 1-4 for
the depth of the tube.
Results
Results - Wooden Block
Reading 1 2 3
Height /
cm
Width /
cm
Length /
cm
9.8 9.7 9.9
4.5 4.4 4.6
4.6 4.7 4.4
Result - Copper Wire (Thick)
Reading 1 2
Top / mm
Middle / mm
Bottom / mm
0.73 0.72
0.74 0.73
0.72 0.73
Result - Copper Wire (Thin)
Reading 1 2
Top / mm
Middle / mm
Bottom / mm
0.37 0.37
0.38 0.37
0.36 0.36
Results - Boiling tube
Reading 1 2 3
External /
cm
Internal /
cm
Depth /
cm
2.41 2.42 2.43
2.28 2.29 2.27
14.68 14.65 14.63
Calculations
Wooden Block
Average length of wooden block
= (9.8 + 9.7 + 9.9)/3
= 9.7 cm
Wooden Block
Average width of wooden block
= (4.5 + 4.4 + 4.6)/3
= 4.5 cm
Wooden Block
Average height of wooden block
= (4.6 + 4.7 + 4.4)/3
= 4.6 cm
Volume of wooden block
= length x width x height
= l x b x h
= 9.7 x 4.5 x 4.6
= 200.79 cm3
= 200.8 cm3 (1 d.p.)
Wooden Bl...
Copper Wire (Thick)
Average diameter of wire
= [(0.73 x 3)+ 0.74 + (0.72 x 2)] / 6
= 0.72833333...
= 0.73mm (2 d.p.)
Copper Wire (Thin)
Average diameter of wire
= [(0.37 x 3)+ 0.38 + (0.36 x 2)] / 6
= 0.368333333...
= 0.37mm (2 d.p.)
Boiling Tube
Average external diameter
= (2.41 + 2.42 + 2.43)/3
= 2.42 cm
Boiling Tube
Average internal diameter
= (2.28 + 2.29 + 2.27)/3
= 2.28 cm
Boiling Tube
Average depth
= (14.68 + 14.65 + 14.63)/3
= 14.65 cm
Discussion
1. Why is it important to take more than 1
reading?
It is to improve accuracy. It is risky to
rely on one answe...
Discussion
2. How do you reduce errors?
When taking measurements, makes
sure the eye is place in front of the object
and n...
Discussion
2. How do you reduce errors?
When recording measurements, always
take note of the zero error. Tools such as
mic...
Discussion
2. How do you reduce errors?
Taking measurements repeatedly to
obtain an average value can reduce the
uncertain...
The End
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Practical #2: Measurements

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Transcript of "Practical #2: Measurements"

  1. 1. Physics Practical 2 Measurement
  2. 2. Objective To calculate the volume of a wooden block To measure the internal and external diameter of a test tube To measure the diameter of a copper wire
  3. 3. Apparatus Used Ruler Wooden block Vernier Caliper Test tube Micrometer screwgauge Copper wire
  4. 4. Procedure
  5. 5. Wooden Block 1. Place the block onto the zero mark of the ruler. 2. Place block in front of the eye level. 3. Take the reading and record in the table.
  6. 6. Wooden Block 4. Repeat step 1,2 and 3 for the width and the breadth. 5. Record the measurements in the same table of results
  7. 7. Copper Wire 1. Check for zero error by turning thimble to close the anvil 2. Note and record the error. (error = -0.01 mm) Copper Wire (Thick)
  8. 8. Copper Wire 3. Turn the thimble so that the anvil can fit the wire. 4. Place the wire in between the anvil. 5. Turn the thimble back gently. Copper Wire (Thick)
  9. 9. Copper Wire (Thick) 6. Read the main scale and the thimble scale. 7. Record the reading in a table of results. 8. Repeat steps 1-7 for another 2 sets of reading.
  10. 10. Copper Wire (Thin) 9. Repeat steps 1-8 for the thin wire.
  11. 11. Boiling Tube 1. Check for zero error by closing the jaws together. (error = 0 cm)
  12. 12. Boiling Tube 2. Open the jaws and place the boiling tube in between. 3. Close the jaws gently until it touches the side of the tube.
  13. 13. Boiling Tube 4. Read the scales and record the values in a table.
  14. 14. Boiling Tube 5. Repeat steps 1-4 for the external diameter.
  15. 15. Boiling Tube 6. Repeat steps 1-4 for the depth of the tube.
  16. 16. Results
  17. 17. Results - Wooden Block Reading 1 2 3 Height / cm Width / cm Length / cm 9.8 9.7 9.9 4.5 4.4 4.6 4.6 4.7 4.4
  18. 18. Result - Copper Wire (Thick) Reading 1 2 Top / mm Middle / mm Bottom / mm 0.73 0.72 0.74 0.73 0.72 0.73
  19. 19. Result - Copper Wire (Thin) Reading 1 2 Top / mm Middle / mm Bottom / mm 0.37 0.37 0.38 0.37 0.36 0.36
  20. 20. Results - Boiling tube Reading 1 2 3 External / cm Internal / cm Depth / cm 2.41 2.42 2.43 2.28 2.29 2.27 14.68 14.65 14.63
  21. 21. Calculations
  22. 22. Wooden Block Average length of wooden block = (9.8 + 9.7 + 9.9)/3 = 9.7 cm
  23. 23. Wooden Block Average width of wooden block = (4.5 + 4.4 + 4.6)/3 = 4.5 cm
  24. 24. Wooden Block Average height of wooden block = (4.6 + 4.7 + 4.4)/3 = 4.6 cm
  25. 25. Volume of wooden block = length x width x height = l x b x h = 9.7 x 4.5 x 4.6 = 200.79 cm3 = 200.8 cm3 (1 d.p.) Wooden Block
  26. 26. Copper Wire (Thick) Average diameter of wire = [(0.73 x 3)+ 0.74 + (0.72 x 2)] / 6 = 0.72833333... = 0.73mm (2 d.p.)
  27. 27. Copper Wire (Thin) Average diameter of wire = [(0.37 x 3)+ 0.38 + (0.36 x 2)] / 6 = 0.368333333... = 0.37mm (2 d.p.)
  28. 28. Boiling Tube Average external diameter = (2.41 + 2.42 + 2.43)/3 = 2.42 cm
  29. 29. Boiling Tube Average internal diameter = (2.28 + 2.29 + 2.27)/3 = 2.28 cm
  30. 30. Boiling Tube Average depth = (14.68 + 14.65 + 14.63)/3 = 14.65 cm
  31. 31. Discussion 1. Why is it important to take more than 1 reading? It is to improve accuracy. It is risky to rely on one answer because that answer maybe 0.1 more or less than it should be.
  32. 32. Discussion 2. How do you reduce errors? When taking measurements, makes sure the eye is place in front of the object and not from the side.
  33. 33. Discussion 2. How do you reduce errors? When recording measurements, always take note of the zero error. Tools such as micrometer often give an error of 0.01 mm so that value must be subtracted from the reading before doing calculations.
  34. 34. Discussion 2. How do you reduce errors? Taking measurements repeatedly to obtain an average value can reduce the uncertainty.
  35. 35. The End To download file go to: http://www.slideshare.net/A1ryn
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