Essentials For Physics

Question 1

a physical quantity contains

Answer 1

a magnitude

a unit of measurement

Question 2

a physical quantity is

Answer 2

something which is observable/ measurable

Question 3

the 7 SI bass units are

Answer 3

M ass
E lectric current
L ength
T ime

A mount of substance
L uminous intensity
T emperature

Question 4

SI units are used so tht

Answer 4

physical quantities are standardised allowing for meaningful comparisons to be made

Question 5

derived unit

Answer 5

a SI unit of measurement comprised of a combination of the seven base units

Question 6

4 basic rules for sig figs

Answer 6

1 leftmost non zero digit is significant
2 no decimal point- the rightmost non zero digit is significant
3 decimal point- the rightmost (maybe) zero is significant
4 all number become significant after the first non zero digit to the left

Question 7

scientific notation in large numbers

Answer 7

insert decimal place after the first number and the decimal point moves to the right

Question 8

scientific notation in small numbers

Answer 8

insert a decimal point after the first number (not zero) and move it to the left

Question 9

prefixes

Answer 9

T tera  x10 power of 12 
G giga  x10 power of 9
M mega  x10 power of 6
K kilo  x10 power of 3
c centi   x10 power of -2
m milli  x10 power of -3
u micro x10 power of -6 
n nano  x10 power of -9
p pico  x10 power of -12

Question 10

calculations

Answer 10

use magic triangle and 7 step approach

Question 11

SQA general marking principles

Answer 11

S top marking after something is 
   incorrect
N o half marks awarded
F ull marks should be awarded for a correct 
   final answer with no working