AS Physics Unit 1.1 Physical Quantities

Question 1

What is the definition of a base unit?

Answer 1

Base units are the units which all other may be derived from.

Question 2

What are the base quantities?

Answer 2

The base quantities are Mass, Length, Time, Electric Current, Thermodynamic Temperature and Amount of Substance.

Question 3

What are the base units?

Answer 3

Their base units are; Kilogram (Kg), Metre (m), Second (s), Ampere (A), Kelvin (K) and Moles (mol).

Question 4

What are the prefix, symbol and multiplication factors?

Answer 4

They are:
Exa, E, 10^18;
Peta, P, 10^15;
Tera, T, 10^12;
Giga, G, 10^9;
Mega, M, 10^6;
Kilo, K, 10^3;
Deci, d, 10^-1;
Centi, c, 10^-2;
Milli, m, 10^-3;
Micro, u, 10^-6;
Nano, n, 10^-9;
Pico, p, 10^-12;
Femto, f, 10^-15;
Alto, a, 10^-18;

Question 5

What are the base units of energy?

Answer 5

Ek = 1/2 x m x v^2
= Kg x ms^-1 x ms^-1
= Kg x m^2 x s^-2
= Kgm^2s^-2

Question 6

What is necessary for an equation to be valid?

Answer 6

The units on both sides of the equality sign have two be the same.

Question 7

What are the equations that are the same on both sides of the equality sign called?

Answer 7

Homogeneous