Units and formulae Flashcards
What are the 2 types of quantities?
Scalar and Vector quantities.
What is a scalar quantity?
A scalar quantity is something that has only magnitude, no direction
What is a vector quantity?
A vector quantity is something that has direction and magnitude
Which type of quantity is speed an example of?
Scalar
What type of quantity is displacement a type of?
Vector quantity
What is negative velocity?
They are going backwards
What are the units in the SI called?
Base units
What are units made up of other units called?
Derived units
What are the 7 base units?
Mol
Kelvin
Seconds
Amperes
Metre
Kilograms
Candella
What is a derived unit?
Unit that is made up of other units
How is speed a derived unit?
What units are speed made up of?
Metres/seconds, m/s
What are commensurate units?
Units that can be converted, eg, metres and centimetres
What are incommensurate units?
Units that you cannot convert, eg, seconds and metres
What is N/M^2 equal to
NM^-2
Can you?
Identify formulae and equations
Label terms in an equation
Manipulate equations to change ‘the subject’
Understand the terms commensurate and incommensurate units
Identify base units and derived units
Use prefixes and be able to convert units from one form to another
Use the homogenous nature of meaningful physical equations to derive unit
Define and identify vectors and scalars
Add and subtract vectors through the use of diagrams
What is the ‘delta’ sign?
Triangle in front of symbol
What does delta mean?
It means change in
When rearranging formula, when you do something to one side of the equation you must __ __ ___ _____ ____ __ ___ ________
Do it to the other side of the equation
Is force a scalar or vector quantity?
Vector because we draw an arrow and we draw it in the direction the force is acting on
What is the difference between a formulae and an equation?
What is nano
Give the decimal number
0.000000001.
What is micro
Give the number
0.000001.
What is milli
Give the number
0.001.
What is centi
Give the number
0.01.
What is kilo
Give the number
1000.
What is mega
Give the number
1000000.
What is giga
Give the number
1000000000.
What is standard form?
Standard form is used to represent very large or very small numbers. In standard form numbers are written in the format: A x 10n where A is a number between 0 and 10 and n is how many places to move the decimal point.
How do we add vectors?
We draw the head of Vector B touching the tail of vector A
How do we subtract vectors?
We draw vector B in the opposite direction from Vector A
What is subtracting vectors equal to?
Add a positive vector to a negative one
