2 Foundations of Physics

Question 1

List the positive prefixes

Answer 1

Peta (P) 10^15
Tera (T) 10^12
Giga (G) 10^9
Mega (M) 10^6
kilo (k) 10^3

Question 2

List the negative prefixes

Answer 2

deci (d) 10^-1
centi (c) 10^-2
milli (m) 10^-3
micro (µ) 10^-6
nano (n) 10^-9
pico (p) 10^-12
femto (f) 10^-15

Question 3

List the 7 SI base units

Answer 3

Length (m)
Mass (kg)
Time (s)
Current (A)
Temperature (K)
Amount of Substance (mol)
– (Candela (cd))

Question 4

Derive force into base units

Answer 4

kg m s^-2

Question 5

Derive pressure into base units

Answer 5

kg m^-1 s^-2

Question 6

Derive energy/work done into base units

Answer 6

kg m^2 s^-2

Question 7

Derive power into base units

Answer 7

kg m^2 s^−3

Question 8

Derive potential difference into base units

Answer 8

m^2 kg s^-3 A^-1

Question 9

Derive resistance into base units

Answer 9

m^2 kg s^-3 A^-2

Question 10

Derive resistivity into base units

Answer 10

m^3 kg s^-3 A^-2

Question 11

Derive frequency into base units

Answer 11

s^-1

Question 12

Derive charge into base units

Answer 12

A s

Question 13

0 Kelvin in °C

Answer 13

-273.15°C

Question 14

Give 5 examples of a vector quantity

Answer 14

displacement
velocity
acceleration
force
momentum

Question 15

Give 9 examples of scalar quantities

Answer 15

length
mass
time
speed
temperature
volume
energy
potential difference
power

Question 16

Define scalar and vector quantities

Answer 16

Scalar - magnitude
Vector - magnitude AND direction

Question 17

Tension 42° from the horizontal. Find horizontal and vertical forces

Answer 17

Horizontal component = 850 × cos 42 = 630 N
Vertical component = 850 × sin 42 = 570 N

Question 18

State the formula for resolving the forces. (θ next to Fx)

Answer 18

Fx= Fcosθ
Fy= Fsinθ

Question 19

State sine rule

Answer 19

a/sinA = b/sinB

Question 20

State cosine rule

Answer 20

a^2 = b^2 + c^2 -2bc cosA