stuff to remember

Question 1

what to do on questions which seem too easy

Answer 1

they probably are too easy, step back, go through them and work it out properly

Question 2

significant figures

Answer 2

significant figures are the first NON 0 number in a sequence

Question 3

what to remember about series when there’s a first number of 0

Answer 3

ignore it, if adding, it’ll make no difference

Question 4

what to remember on questions asking about power

Answer 4

remember the time period may not be 1 second

Question 5

what is the difference between x^-n and x^(1/n)

Answer 5

X^-n = 1/x^n
x^(1/n) = nth root of x

Question 6

what to do on questions which contain free fall and acceleration

Answer 6

do f = ma fully and draw a diagram

Question 7

what to remember about proportionalities in Hooke’s Law

Answer 7

F = kx
not F = kL
i.e. force is directly proportional to extension, not length

Question 8

what to remember about doing pressures in water

Answer 8

don’t forget atmospheric pressure will still apply, so you may need to take it away before you calculate deltaH

Question 9

what to remember about half-life ratio calculations

Answer 9

they start on a ratio of 1:1

so the sum of the ratio numbers must always be 2

Question 10

what to remember on volume questions

Answer 10

don’t forget if you calculate mass, divide by density to find volume