IGCSE CIE Physics - Scalars and Vectors
CHAPTER 1 Physical quantities and units
distinguish between scalar and vector quantities and give examples of each
add and subtract coplanar vectors
represent a vector as two perpendicular components
There are roughly two kinds of Physical quantities: scalars and vectors
Examples for scalar: distance, speed, mass, charge, energy
Examples for vector: displacement, velocity, force, acceleration, momentum, energy flow
You may wonder what good does a vector do! A fair question. For the poor man above, he will definitely want to know the direction of the arrow before shooting! Magnitude alone is not enough to describe the arrow's motion. In Physics, when necessity calls, we invent! Kind of feel like an entrepreneur, huh?
triangle of vectors : a + b :
On the other hand:
Caution! 🧐In IGCSE CIE Physics, they may ask you to calculate the resolved vectors!
Q: If I make up some crazy stuffs like: [ 2 apples, 5 oranges ] ...... is this a vector?
A: No, actually a vector also has to rotate like a vector... you can't rotate that thing (at least not meaningfully).
That's all, see you next time! 🤘
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Written by Shing, Physics & Mathematics Specialist @ TUTTEE
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