Chapter 2- Foundations

Question 1

How many SI units are there?

Answer 1

6, (7 if candela included)

Question 2

Name the 6 SI units you need to know

Answer 2

Mass- kg
Length- m
Time- second s
Current- amp I
Temperature- kelvin K
Amount of a substance- mole, mol

Question 3

Name all the prefixes for magnitude

Answer 3

Pico- 10^-12
Nano- 10^-9
Micro- 10^-6
Mili- 10^-3
Centi- 10^-2
Deci- 10^-1
Kilo- 10^3
Mega- 10^6
Giga- 10^9
Tera- 10^12

Question 4

What is uncertainty usually caused by

Answer 4

Random and systematic errors

Question 5

What are systematic errors

Answer 5

Systematic errors are errors which remain constant throughout the experiment. Usually causws by equipment. They affect accuracy. To prevent, check apparatus and calibrate properly.

Question 6

what are Random errors?

Answer 6

Random errors vary. They can be caused by a range of things, they are hard to avoid as it’s difficult to keep control variables completely unchanged. Using more sensitive equipment can reduce random error as well as repeating measurements.

Question 7

To combine uncertainties of adding and subtracting data?

Answer 7

Add the absolute uncertainties

Question 8

Combining uncertainties when multiplying orndividing data?

Answer 8

Add the percentage uncertainties

Question 9

Uncertainties when Raising to a power?

Answer 9

Multiply the percentage uncertainty by the power

Question 10

Scalar?

Answer 10

A quantity with magnitude and no direction

Question 11

Vector?

Answer 11

A quantity with direction and magnitude