1. measurements

Question 1

tera (T)

Answer 1

10¹²

Question 2

giga (G)

Answer 2

10⁹

Question 3

mega (M)

Answer 3

10⁶

Question 4

kilo (k)

Answer 4

10³

Question 5

deci (d)

Answer 5

10^-1

Question 6

centi (c)

Answer 6

10^-2

Question 7

milli (m)

Answer 7

10^-3

Question 8

micro

Answer 8

10^-6

Question 9

nano (n)

Answer 9

10^-9

Question 10

measuring tape

Answer 10

length to be measured: several metres
precision: 0.1cm
recording: 0.1cm

Question 11

metre rule

Answer 11

length to be measured: several cm to 1m
precision: 0.1cm
recording: 0.1cm

Question 12

digital calipers

Answer 12

length to be measured: between 1cm and 10cm
precision: 0.001cm or 0.01mm
recording: 0.01cm or 0.1mm

🌟 remove any zero error: close jaws before taking measurements, press tare function

Question 13

digital micrometer screw gauge

Answer 13

length to be measured: less than 2.5cm
precision: 0.0001cm or 0.001mm
recording: 0.001cm or 0.01mm

🌟 remove zero error: turn thimble, close anvil and spindle, turn ratchet to slightly tighten anvil and spindle, tare function
🌟 ratchet click sound when grip/pressure exerted on measured object is just right

Question 14

parallax error

Answer 14

🌟 systematic error

ensure line of sight perpendicular to ruler

Question 15

multiple readings

Answer 15

measuring external diameter (e.g. a wire) -> take more than 1 reading

measure at different places

take average of 6 readings

🌟 random error

Question 16

stopwatch

Answer 16

🌟 to 2dp
- measure short intervals of time
- measured according to what is on the display

Question 17

human reaction time

Answer 17

*hand operated stopwatch -> random error -> human reaction time (~0.3s)

varies for diff people/diff measurements taken by same person

🌟 all time measurements should be repeated and calculated average