Displacement versus distance


Then this is the direction of this magnitude okay a distance not necessarily a distance but a displacement it's what falls under vector quantity. So a displacement you can have a displacement which is negative 2 meter which could be positive, let's say 4 meter so that negative ladies and gentlemen it serves as a sign to say this is a distance measured maybe when the object was covering a distance upwards or a distance downwards then you've got a velocity which could be a seven meters per second eastwards to the right, westwards to the left, upwards towards the north, downwards or southwards so these are the quantities which have a magnitude or a value which is the amount and again the direction in which they are moving.

When it comes to scalar quantities, it's just a time which is known to be two seconds or whatever it's the mass which could be two kg or two grams whatever you've got the distance which is just seven meters or kilometers you've got a frequency which could be 150 Hz or whatever that it is. So in short ladies and gentlemen when it comes to time you will never have two seconds to the left okay. You will never have a 9 kg upwards, you will never have a distance as 50 meters or 100 kilometers to the right. 

Same goes for frequency, is just a magnitude ladies and gentlemen time has got no directions in physical sciences, time false under scalar quantities okay very much important ladies and gentlemen. Why am I telling you this information ladies and gentlemen, remember the question said calculate the velocity of the car relative to the truck. 

So the velocity that they want us to calculate is it a scalar or a vector quantity? It's a vector quantity ladies and gentlemen, what does it mean when it's a vector quantity? It must have a magnitude of value and a direction okay which is a good indication that one mark might be allocated to the magnitude and the other mark might be allocated to the direction.

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