Unit 2 - Measuring, Recording and Processing Data G10 Flashcards
Write to one significant figure the number : 54.7
50
Write to one significant figure the number : 3005
3000
Write to one significant figure the number : 8.9
9
Write to one significant figure the number : 3556
4000
Write to one significant figure the number : 0.00359
0.004
Write to the nearest tenth , e.g. to the nearest 0.1 the number : 3005.58
3005.6
Write to the nearest tenth , e.g. to the nearest 0.1 the number : 0.1988
0.2
Write to the nearest tenth , e.g. to the nearest 0.1 the number : 3.00567
3.0
Write to the nearest hundredth , e.g. to the nearest 0.01 the number : 0.1988
0.20
Write the correct full average (no rounding) of the following numbers: 2.34, 3.45, 5.56, 6.35 ,4.81
4.502
Write to the nearest hundredth , e.g. to the nearest 0.01 the number : 3.00567
3.01
Write the uncertainty of the following numbers to 1 s.f. (one significant figure): 2.21, 2.45, 2.91,
0.4
A number of readings are taken. The uncertainty to 1 s.f. is 0.07. The full average is 94.568. Write down the correctly rounded average
94.57
What is the title of the Dependent Variable?
Time (being effected)
Why are there four (4) time results for each length result?
The object was timed four times for each length
From the above graph write a conclusion (you will have to check the answer afterwards
As the number of apples increses by 1 the number of oranges increases by 0.25
Does this graph support the hypothesis that the number of apples and oranges will increase at the same rate? Explain
The results do not support the hypothesis. The number of apples needs to increase by 4 to cause an increase in oranges by 1
Hypothesis
If we increase the distance of the object to the mirror (cm) then the average distance of the image to the mirror will also increase.
This is because, using the law of reflection, the angle of reflection equals the angle of incidence. We can see that the image formed by the mirror is at the same distance as that of the object.
Explain the origin of the instrument uncertainty
The uncertainty of ± 0.1 in the distance of the object to the mirror is due to the size of the smallest unit on the table of results.
The uncertainty of ± 0.1 in the distance of the image to the mirror is due to the size of the smallest unit on the table of results.
Describe what the graph is showing using both of the variables names and how they change.
As the distance of the object to the mirror increases the average distance of the image to the mirror increases.
Describe any ‘fit’ that you can use for the graph.
As we can draw a straight line through the points and error bars, we can use a line of best fit.
Write down the formula from the graph
(you will not be able to access full marks without the formula)
Use correct variables (not X and Y)
A = 0.9400D + 0.1600
Interpret the formula in terms of the variables including numbers
The formula tells us that the change of slope is that as the ‘D’ increased by one, the ‘A’ increased by 0.9400.
Discuss the result in light of the hypothesis; you must be using the word ‘CHANGE’, you must compare the rate of change that you have found from your graph (not your raw results) to the predicted rate of change. Do your results support (give evidence for) the hypothesis?
In my hypothesis, I predicted that the ‘A’ would increase with the same amount as ‘D’. My results show that ‘A’ increases by 0.9400 when ‘D’ increases by 1. Although there is a strong correlation (0.9992), they are not increasing by the same amount.
What to explain in conclusion
Use gradient to find how much y-axis increases in comparison to x-axis
For example, m=0.25, so as x increases by 1 while y increases by 0.25.
every 4 times x increases y increases by 1
Hypothesis
Focused research question:
How does changing the independent variable affect the dependent variable?
1) if the independent variable increases the dependent variable will: increase/decrease/stay the same
2) by a constant amount (the gradient) or not constant (no gradient)
3) same/different amount (using the gradient) ex: gradient = 1 is same.
What does y intercept represent in the formula for a line?
l
whay does gradient represent in the formula for a line?
