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Module 2 - Chapter 2 - Foundations of Physics - Coggle Diagram
Module 2 - Chapter 2 - Foundations of Physics
Quantities
A physical quantity is a property of an object or a phenomenon that can be measured
Many quantities consits of numbers and units
SI units are the standard system of units
SI base units
length in metres(m)
mas in kilograms(kg)
time in seconds(s)
electric current in amperes(A)
Temperature in kelvin(K)
amount of substance in moles(mol)
luminous intensity in candelas(cd)
Derived units
Can be worked out from the base units
any quantity can be communicated
Scaler quantities
Has magnitude but no drection
They can be added together or subtracted from one another in a usual way
Scaler quantities must have the same units when you add/ subtract them
They can be added/ divided, but units don't have to be the same
Vector quantities
Has magnitude and direction
Examples - displacement, velocity, acceleration
Two vectors that are parallel can be added to find the resultant vector. Direction of the resultant force is the same, but magnitude is greater
Antiparallel vectors
Parallel but in opposite directions
You assign one direction as negative and one as positive
Add the vectors together to get the final result
Perpendicular vectors
Act at right angles to eachother
Resultant force can be found either by calculation or by scale drawing of a vector triangle
Use pythagoras' theorem to determin the hypoteneuse