2.1 Physical Quantities and units

Question 1

What is a quantity?

Answer 1

• a measurement of something

Question 2

What is the systeme international (S.I.)?

Answer 2

• international scientific community that agreed to adopt a single unit for each quantity:
• kilogram, kg (mass)
• metre, m (length)
• second, s (time)
• kelvin, K (temperature)
• ampere, A (current)
• mole, mol (amount of substance)
• candela, cd (luminous intensity)

Question 3

Acceleration units?

Answer 3

Ms-2

Question 4

Density units?

Answer 4

Kgm-3

Question 5

Units of electric charge?

Answer 5

C

Question 6

Units of energy?

Answer 6

J

Question 7

Unit of force?

Answer 7

N

Question 8

Unit of momentum?

Answer 8

Kgms-1

Question 9

Unit of potential difference?

Answer 9

V

Question 10

Unit of power?

Answer 10

W

Question 11

Unit of pressure?

Answer 11

Pa

Question 12

Unit of velocity?

Answer 12

Ms-1

Question 13

Prefix pico (p)?

Answer 13

10^-12

Question 14

Prefix nano (n)?

Answer 14

10^-9

Question 15

Prefix micro (u) ?

Answer 15

10^-6

Question 16

Prefix milli (m)?

Answer 16

10^-3

Question 17

Prefix centi (c)?

Answer 17

10^-2

Question 18

Prefix deci (d)?

Answer 18

10^-1

Question 19

Prefix kilo (k)?

Answer 19

10^3

Question 20

Prefix mega (M)?

Answer 20

10^6

Question 21

Prefix giga (G)?

Answer 21

10^9

Question 22

Prefix tera (T)?

Answer 22

10^12

Question 23

What does it mean to prove an equation is homogenous?

Answer 23

• prove that the units for each part of the equation are the same