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Measurements Lab Requirements pt 2 What you should calculate: (show all work, preferably on another paper, if you want me to find your mistakes) 1.All values should have: value ± abs error units (% error) 2.Top box: row 3 should have 2 values: a subtraction (and errors), and a division (and errors). Follow rules for errors. 3.Bottom box: Calculate radius, area, volume, and density from the measurements. Each value should have absolute & percent errors and units calculated. Remember water = 1 g/cm 3 for comparison. 4.(continued)
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2 problems collected from HW A today – JUST checking notation. 2 pts each.
– 1.35, 1.42
Measurements lab due Monday.Homework B due Tuesday.Test on this stuff on Thursday. (Test does
NOT cover lab materials.)
Measurements Lab Requirements pt 1
What you should have finished in lab on Wednesday: (if you need more time, let me know ASAP)
1. Measure inside & outside diameters of graduated cylinder.
2. Measured mass of metal cylinder3. Measured diameter of metal cylinder using
micrometer4. Measured height of metal cylinder using Vernier
Caliper5. Measured your knuckle width with Vernier Caliper &
told me the value
Measurements Lab Requirements pt 2What you should calculate: (show all work, preferably on
another paper, if you want me to find your mistakes)1. All values should have: value ± abs error units (%
error)2. Top box: row 3 should have 2 values: a subtraction
(and errors), and a division (and errors). Follow rules for errors.
3. Bottom box: Calculate radius, area, volume, and density from the measurements. Each value should have absolute & percent errors and units calculated. Remember water = 1 g/cm3 for comparison.
4. (continued)
Measurements Lab Requirements pt 3What you should calculate:4. When ABSOLUTE errors are MEASURED, they
should have 1 significant figure. The size of the absolute error is based on how well you think the tool works or how well you used it.
5. When ANY error is CALCULATED, use two significant figures.
6. Calculate the class average knuckle width, the standard deviation of the data, how many data values fit inside the 1 and 2 ranges, which range your knuckle is in, and answer the question at the bottom of the page. Download data from web page. [FOR YOUR OWN GOOD: See M & M data for examples of how to do these calculations.]
Review questions coming
• Similar to Quick Quiz 2 on page 31
An object is moving to the right. Which sign is its velocity?
3
0
32 1. Positive2. Negative3. Not enough info to answer
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61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
An object is moving to the right. Which sign is its position?
5
1
29 1. Positive2. Negative3. Not enough info to answer
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An object is moving to the right. Which sign is its acceleration?
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11 1. Positive2. Negative3. Not enough info to answer
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An object is moving to the right and speeding up. Which sign is its acceleration?
3
1
32 1. Positive2. Negative3. Not enough info to answer
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61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
An object is moving to the left and speeding up. Which sign is its velocity?
2
29
5 1. Positive2. Negative3. Not enough info to answer
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An object is moving to the left and speeding up. Which sign is its acceleration?
2
30
4 1. Positive2. Negative3. Not enough info to answer
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Which of the following can be represented by negative acceleration?
25
10
0
1
0 1. Speeding up2. Slowing down3. Being stopped4. Both 1 & 25. All of the above
What does the book say on page 29?
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Graphs• Review rules for x-t & v-t graph• Show an accelerating object on v-t graph
– Clicker question (next slide)• Show rules for v-t & a-t graph [negative area!]• Average velocity equation
For constant acceleration only:• Acceleration equation • Area under v-t graph equation• Other equations of motion
At the end of the a-t graph shown, what is the velocity?
33%
33%
33%
1 2 3 4 5
1. Positive (which means moving which way)2. Negative (which means moving which way)3. It is stopped
At the end of the a-t graph shown, what is the acceleration?
33%
33%
33%
1 2 3 4 5
1. Positive2. Negative3. Zero
Acceleration graphs
• Do quick quiz 2.3 (page 32) with clickers. (next few slides)
• Do quick quiz 2.4 (page 34) with clicker (slide after)
Refer to page 32, figure 2.10. Top row = v-t graphs.Bottom Row = a-t graphs. Which in bottom matches with “a”?
0
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2
0
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0 1. Don’t pick2. Don’t pick3. Don’t pick4. D5. E6. F
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Refer to page 32, figure 2.10. Top row = v-t graphs.Bottom Row = a-t graphs. Which in bottom matches with “b”?
3
1
32
0
0
1 1. Don’t pick2. Don’t pick3. Don’t pick4. D5. E6. F
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Refer to page 32, figure 2.10. Top row = v-t graphs.Bottom Row = a-t graphs. Which in bottom matches with “c”?
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0
2
0
0
0 1. Don’t pick2. Don’t pick3. Don’t pick4. D5. E6. F
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Refer to page 34, figure 2.13. Which graph is physically impossible? Select all that apply.
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0 1. A2. B3. C
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After working on the handout a bit
Quick Quizzes 2.6, 2.7 with clickers.Quick Quiz 2.8 is a good question to help
you understand acceleration.
A tennis player on serve tosses a ball straight up. While the ball is in free fall, does its acceleration:
20%
20%
20%
20%
20%
1 2 3 4 5
1. Increase the whole time2. Decrease the whole time3. Increase then decrease4. Decrease then increase5. Remain constant
As the tennis ball travels through the air, its speed:
20%
20%
20%
20%
20%
1 2 3 4 5
1. Increases the whole time2. Decreases the whole time3. Decrease then increase4. Increase then decrease5. Remain constant
