Chapter 2

Question 1

What are the seven SI base units

Answer 1

Length = meters
Energy = joules 
Current = Amps
Quantity = moles 
Temperature = Kelvin 
Time = secind 
Candela not needed

Question 2

What is derived units then

Answer 2

Anything that is not that so like Newton I think resistance etc

Question 3

Prefixes need to know from -15 to 15!

Peta/ pico and femto really

Answer 3

Femto = -15
Pico= -12
Nano= -9
Micro =-6
Mili = -3 
Centi= -2
Deci= -1
Kilo = 3
Mega =6
GIGA = 9
Tera= 12
PETA= 15

Question 4

WHAT IS A DERRIVED UNIT

Answer 4

anything that isn’t A BASE UNIT = DERRIVED

Question 5

Vectors have a mangnitude and a direction

What is displacement

Answer 5

So the distance is the total length between two points in a route

The displace tan is the SHORTEST distance in a straight line between two points

Question 6

How to add vectors?
If parallel
- if perpendicular

Answer 6

• if parallel add them by giving them directions then adding
• if perpendicular make a HEAD TO TOE TAIL DOAGRAM, find the resultant force and the ANGLE as vectors have both remember!

3) if non perpendicular , resolve into components , add them etc and then do a triangle and find ANGLE!

Question 7

Why is power a scalar even tho force x distance

Answer 7

This force can only act in one direction making it a scalar essentially

Something like Moment can happen in two directions so vector!

Question 8

Remember when do you discard a value! And not include it in calculations?

Answer 8

Basically when its several orders of magnitude below , like 3 times then leave it