physics - key concepts

Question 1

what are SI units?

Answer 1

to express quantities in measurements

Question 2

list the SI units: (7)

Answer 2

• Kg - kilogram
• K -Kelvn - unit in temperature
• m - mass
• s - seconds
• A - ampere
• Mole

Question 3

list all the prefixes (e.g milli)

Answer 3

• giga (G) x 10 to power of 9
• mega (M) x 10 to power of 6
• kilo (K) x 10 to power of 3
• centi (c) x 10 to power of - 2
• mili (m) x 10 to power of -3
• micro (M) x 10 to power of -6
• nano )n) x 10 to power of -9

Question 4

when a prefix is a negative number (e.g centimetre is 10 to power of -2), what do you need to do to convert?

Answer 4

you have to divide