SI
Measurement
Significant Digits
Data Analysis
Hodge Podge
100
What are two advantages of SI?
1.) International communication 2.) Ease of conversion because the SI is a base 10 system
100
what is a measurement?
A measurement is a comparison between an unknown quantity and a standard.
100
What are significant digits?
All of the valid digits in a measurement. They include all of the marked increments and one estimated value.
100
What is the difference between the independent and dependent variable?
The experimenter is in control of the independent variable and the dependent variable is the thing that changes as a result of changes in the independent variable.
100
What is the scientific method?
A systematic method of observing, experimenting and analyzing information to answer questions about the natural world.
200
How is the SI regulated? ( name the two organizations)
1.) International Bureau of Weights and Measures 2.) National Institute of Standards and Technology
200
What is the difference between accuracy and precision?
Accuracy is in reference to how close the value is to the correct or accepted value. Precision is in reference to how repeatable a value is.
200
Either give the Atlantic Pacific rule or the 5 rules that are used to determine the number of significant digits in a measurement.
Atlantic Pacific- If the decimal point is absent you begin counting sig figs when you start on the Atlantic side and get to the first nonzero number. If the decimal point is present begin counting when you get to the first nonzero number on the Pacific side. or 1. nonzeros are always significant. 2. zeros between nonzeros are significant 3. zeros trailing a nonzero after a decimal are significant. 4. zeros following a decimal but before a nonzero are not significant. 5. all values before the x 10^ exponent when numbers are written in scientific notation are significant.
200
Where are the independent and dependent variables placed on a graph?
Independent is placed on the x axis and the dependent is placed on the y axis.
200
A Honda Civic is approaching a red light. A Ferrari is stopped at the red light. As soon as the Civic reaches the intersection the light turns green. If the Civic was moving at 10 m/s and then pushes the accelerator to 4 m/s^2 and the Ferrari pushes the accelerator to 10 m/s^2, who would win a 500 meter race?
The Ferrari gets there 3 seconds ahead.
300
What is a derived unit?
It is a combination of base units.
300
What is two point callibration?
A method for checking the accuracy of an instrument.
300
Describe how you would determine the number of significant digits when multiplying or dividing measured values. Perform the following calculation. ( 7.03 x 10^4) / ( 1.2 x 10^3)
divide the numbers and then report the smallest number of sig figs in either the numerator or denominator. In this problem that is 2 sig figs. 5.9 x 10 ^1
300
What is the line of best fit?
The line that is drawn as close as possible to all of the data points as possible. The line of best fit is used for predictions.
300
Convert 90 Km/hour to m/s
25 m/s
400
Convert 100 nm to kilometers
1 x 10 ^ -10 Km
400
Correctly give the following measurement with the correct level of uncertainty.
31.5 +/- .05
400
Correctly identify the number of sig figs in the following measurements. a.) 0.005010 b.) 105,000 c.) 1.050 x 10^-2 d.) 6.000000 x 10^3
a.) 4 b.) 3 c.) 4 d.) 7
400
Give the equation for each of the following relationships. a.) linear b.) inverse c.) quadratic
a.) y = mx + b b.) y = a/x c.) y = ax^2 + bx + c
400
What is the precision of an instrument?
one half of the smallest significant digit in the measurement.
500
What are the 7 base units and the associated dimension?
1.) meter- length; 2.) second- time; 3.) Kelvin- temperature; 4.) amount of substance- mole;5.) candela- luminous intensity ; 6.) amperes- electric current. 7.) kilogram - mass
500
what is parallax?
The apparent shift in the position of an object when viewed from a different angle.
500
Describe how you would determine the correct number of significant digits when adding or subtracting a measured value. Perform the following calculation. ( 7.03 x 10^4) - ( 1.25 x 10^3)
You report the common place value 6.90 x 10^1 or 69.0
500
An investigator wants to find how speed varies with time. She determines the speed at various times and plots the information on a graph. What are the units of the slope?
m/s^2
500
The pressure on a surface is equal to the force divided by the area. A woman exerts a force ( weight) of 520 newtons on the floor. If the pressure on the floor is 32,500 N/m^2, what is the area of the soles of her shoes?
0.016 m^2
M
e
n
u