2.1 Physical Quantities and Units

Specification point 2.1 Physics OCR A A-level

Name 6 S.I base quantities

-Length

-Mass

-Time

-Current

-Temperature

-Amount of substance

State the S/I base unit and symbol for length

Metre (m)

State the S/I base unit and symbol for mass

Kilogram (kg)

State the S.I base unit and symbol for time

Seconds (s)

State the S.I base unit and symbol for current

Ampere (A)

State the S.I base unit and symbol for temperature

Kelvin (k)

State the S.I base unit and symbol for amount of substance

Mole (mol)

What is homogeneity of units

The units in an equation must be equal on both sides.

What are S.I base units

7 base units in which every other unit is derived from

What is the symbol and unit of the prefix nano

n

1 × 10^-9

What is the symbol and unit of the prefix micro

1 × 10^-6

What is the symbol and unit of the prefix milli

m

1 × 10^-3

What is the symbol and unit of the prefix centi

c

1 × 10^-2

What is the symbol and unit of the prefix deci

d

1 × 10^-1

What is the symbol and unit of the prefix kilo

k

1 × 10³

What is the symbol and unit of the prefix mega

M

1 × 10^6

What is the symbol and unit of the prefix giga

G

1 × 10^9

What is the symbol and unit of the prefix tera

T

1 × 10^12