physics unit 1
Which of the following are 2 rules for determining significant figures?
Zeros between nonzero digits are significant. All nonzero digits are significant.
What 3 types of problems can occur that would affect accuracy and precision?
careless calculations careless experimentation improper measuring equipment
accuracy - how close a measurement is to its true value vinculum - a bar over a number or expression
precision - how close the items in a set of measurements are to each other significant figures - all the known digits in a measurement, plus one estimated last digit
Based on the information learned in the lesson, what is the difference between accuracy and precision?
Accuracy refers to how close a number is to its true value while precision refers to how close the measurements are to each other.
Which of the following are 2 rules for determining significant figures?
Final zeros to the right of the decimal point are significant. Zeros to the left of the first nonzero digit are not significant
Which of the following are 3 rules for rounding numbers?
If the digit to the right of the last significant figure is a 5 followed by a 0 (or no digit), do not round the last significant figure up if the last significant figure is an even number. If the digit to the right of the last significant figure is a 5 followed by a 0 (or no digit), round the last significant figure up one if the last significant figure is an odd number If the digit to the right of the last significant figure is a 5 followed by any digit greater than 0 (1-9), round the last significant figure up one.
Which of the following are 2 rules for rounding numbers
If the digit to the right of the last significant figure is a 5 followed by a 0 (or no digit), round the last significant figure up one if the last significant figure is an odd number If the digit to the right of the last significant figure is 6 or greater, round the last significant figure up one.
How can accuracy be limited?
It may be limited by your measurement devices.
What is meant by significant figures?
Measurements generally include a certain degree of accuracy, plus one estimated figure.
rules for determining significant figures?
1. All nonzero digits are significant. 2. If the digit to the right of the last significant figure is 4 or less, do not change the last significant figure. 3. Zeros to the left of the first nonzero digit are not significant. 4. Final zeros to the right of the decimal point are significant. 5. Final zeros in numbers without a decimal point are not significant unless their significance is indicated by a vinculum (bar) over the last significant figure. 6. Constants, coefficients in physics and chemical equations, temperatures, numbers obtained by counting objects, and numbers that are not measurements are not considered when determining the number of significant figures.
