Physics test 2 grade 10 Flashcards
What is the smallest unit for a ruler?
0.1 cm
What is the smallest unit for a protractor?
1 Degree
How is the length of a line expressed with uncertainty?
1.0 ± 0.1 cm
What does the notation 1.0 ± 0.1 cm indicate?
The line could be 0.9 cm to 1.1 cm.
What is the uncertainty in measurement based on?
The smallest unit on the instrument.
What is the maximum interval calculation from 9:10 to 9:25?
16 minutes
What is the minimum interval calculation from 9:10 to 9:25?
14 minutes
What is the average time interval calculated from 9:10 to 9:25?
15 ± 1 minutes
How do you express a measurement using a protractor?
Angle ± 1 °
What do we call uncertainties that arise from various factors, including measurement limitations?
Random uncertainties
What is the process to find the uncertainty of a set of readings?
Largest reading - smallest reading, divided by 2.
how to detect significant figures in rounding?
Start from the left; first non-zero number is the first significant figure.
What is the uncertainty of the readings 122, 123, 125, 119, 117?
4
What is the value of the digit 3 in 100.03?
3 hundredths
When calculating average, how should it be written in relation to uncertainty?
To the same place value as the uncertainty.
What should be done if the random uncertainty is smaller than the instrument uncertainty?
Use the instrument uncertainty.
What is the final result format when including uncertainty (in tables)
Average ± uncertainty
Fill in the blank: The uncertainty in a measurement is always to _______.
one significant figure
What is the average time calculated from readings 2.01, 2.22, 1.98, 2.05, and 2.01?
2.1 to 1 s.f.
What does the uncertainty of ± 0.1 in length readings come from?
The smallest unit on the ruler.
What does the uncertainty of ± 0.1 in time readings come from?
The smallest unit on the stopwatch.
place values of
5432.109
5 - thousands
4 - hundred
3- tens
2 - ones/units
.
1 - tenths
0 - hundredths
9 - thousandths
in scientific notation how to tell if it is two or one sig fig
5.0 x 10^9 - two sig figs
5 x 10^9 - one sig figs
what dec place is uncertainty
1 significant figure
how does uncertainty relate to average
average is to the same place value as uncertainty
ex:
if uncertainty = +- 0.1, then
average = 63.215 -> 63.2
two types of uncertainty
instrument (smallest unit) - horizontal
random (max-min/2) - vertical
5432.109 significant figures
5432.11 - 6 sig fig
5432.1 - 5 sig fig
5432 - 4 sig fig
5430 - 3 sig fig
5400 - 2 sig fig
5000 - 1 sig fig
how to find uncertainty
random: min - max divided by 2
Instrument: smallest unit on device
how to draw table
column 1 - independent variable
column 2 - dependent variable
under column 2 - individual trials
column 3 - random uncertainty
column 4 - average
Include instrument uncertainties in titles
