Chapter 2 Foundations of Physics Flashcards
What is the SI unit for length?
m Metres
What is the SI unit for mass?
kg Kilogram
What is the SI unit for time?
s Seconds
What is the SI unit for electric current?
A Amperes
What is the SI unit for temperature?
K Kelvin
What is the SI unit for amount of substance?
mol Mole
What is a physical quantity?
Something that can be measured
What is SI?
It is a standard system of units that is used by all scientists.
What is the order and magnitude for all the prefixes from x10^-15 to x10^15
Peta = x10^15 Tera = x10^12 Giga = x10^9 Mega = x10^6 Kilo = x10^3 Deci = x10^-1 Centi = x10^-2 Milli = x10^-3 Micro = x10^-6 Nano = x10^-9 Pico = x10^-12 Femto = x10^-15
What are derived units?
These are units that can be worked out using the base units and equations relating derived quantities.
What is the equation for average speed?
Avg Speed = Distance / Time
What is the unit and derived unit for Force?
Newton (N) = kgms-2
What is the unit and derived unit for Pressure?
Pascal (Pa) = Nm-2
What is the unit and derived unit for Work done or Energy?
Joule (J) = Nm
What is the unit and derived unit for Power?
Watt (W) = Js-1
What is the unit and derived unit for Potential Difference?
Volt (V) = JC-1
What is the unit and derived unit for Electrical Resistance?
Ohm (Ω) = VA-1
What is the unit and derived unit for Frequency?
S-1
What is a scalar quantity?
It is a quantity that has a magnitude but no direction
What is a vector quantity?
It is a quantity with a magnitude and a direction
Name scalar quantities (9 different quantities)
Length Mass Time Speed Temperature Volume Energy Potential Difference Power
Name vector quantities (5 vector quantities)
Displacement Velocity Acceleration Face Momentum
How are parallel vectors combined?
They are added
How are antiparallel vectors combined?
You add them together but one must have a negative value so the result should be smaller
How are two perpendicular vectors combined?
Pythagoras theorem is used
On a vector diagram what does a) the length of the line and b) the direction of the line
a) The magnitude
b) the direction to which it acts
What is resolving a vector?
This is when the problem is broken down into the x component and the y component
Name the 3 methods to adding non perpendicular vectors?
Method 1: Scale diagram
Method 2: Using the sine and cosine rules
Method 3: Resolve each vector and combine
