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- YumYum247

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- YumYum247

25) Use Google maps to find the displacement of the truck when it stops at the Shaw Festival Theatre. Use the scale on the map (bottom left corner) to establish the magnitude of the displacement and include a rough estimate of direction. Then calculate the average velocity of the truck.

- YumYum247

##### 1 Attachment

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- YumYum247

the actual distance between the two points is 135KM.

- YumYum247

I can't figure out the displacement part tho since the whole trip includes all sorts of ups and downs, twists and turns...........:"(

- YumYum247

@IrishBoy123 Please Help!!!

- IrishBoy123

displacement is not the same as distance
are you studying vectors maybe
if i run to the shop and back 100 times, my displacement when i get back will be zero
i will have run 2 x 100 x the distance from the shop
my average speed will be that distance divided by the time it took
my average velocity will be zero because back and forward velocities cancel out
does that make sense?

- YumYum247

Vectors aren't introduced in this chapter......I'm dealing with simple displacement like you just mentioned above.........dear i know how to calculate all that but the only thing that's been confusing me is how do i calculate the displacement of the truck in those winding and twisting roads.......??

- YumYum247

Do you want me to give you a quick example of what i'm dealing with here???? let me upload another question from the same test........

- YumYum247

##### 1 Attachment

- YumYum247

That's the first part of the question. (picture above)

- IrishBoy123

this is a war or words! but also of underlying ideas!
for the first one you posted, if B on the map is the theatre, the *displacement* is a vector whose magnitude is the distance AB on the map, and who direction is whatever you get off that map as an angle say to the North-South direction. its asks you to calculate its magnitude and roughly estimate its direction. and from that to calculate average *velocity*. which will be displacement/ time and in the same direction.
the second one talks about *distance* which you correctly measured as the area under the graph. and then it asks for average *speed*.
make any more sense? or just makes it worse?!?!

- YumYum247

Point B is the final destination of the Truck (Shaw festival Theater), the most i've done in this chapter is add and subtract out opposite directions.....say if i walk 10m (north) and 5m (south), my displacement would be 5m (north). So in that sort of manner how do i calculate he displacement of the entire journey..... Point A is the Toroto Hall and Point B is the Shaw festival theater.

- YumYum247

where the journey ends.

- YumYum247

that's what i'm confused about, because the whole journey takes all sorts of turns, first it goes West, then gradually goes to South and at the end the truck is in the east with respect to the reference point.

- YumYum247

acutally south east, if i were to draw on a proper scale.

- IrishBoy123

measure A - B , as the crow flies. ie straight line.
that is the magnitude of the displacement. ie the amount of the displacement.

- YumYum247

Oh i got it.... so that distance would be the displacement??????
A direct line from point A to Point B.

- IrishBoy123

the turns cancel each other out.
|dw:1440610508815:dw|

- IrishBoy123

yes

- YumYum247

wait if we were to do that experiment in more of a simpler way how would you prove that your method is right.... prove with a simpler example....

- YumYum247

so your saying that if i go lets say 45deg from North to east for 50 meters, and then go straigh to west for 90m, and measure my displacement from the origin to the final destination...... all i have to do is draw a straight line....???? like this...

- YumYum247

|dw:1440621615856:dw|

- YumYum247

if we consider our drawing is to the scale.....

- IrishBoy123

https://gyazo.com/c25286f3653031d4ebe5bb124f007266

- IrishBoy123

yes
you split your motion into movements in the x direction and motions in the y direction and add up the components

- IrishBoy123

that's sounds complicated, just drawing a line between start and end point gives you the final displacement

- YumYum247

ok I didn't know that.......Thanks!!!!

- YumYum247

wouldn't that be the Net displacement?? from point A to point B

- IrishBoy123

it's displacement
you can ad net in if you feel more comfortable but that is displacement in this context
eg the displacement of a ship is its weight in that particular context
but here where you are effectively looking at vectors, so displacement

- YumYum247

Thanks man you saved my life!!! :")

- IrishBoy123

always glad to yelp

- YumYum247

You know they say, helping one person is like helping the entire humanity. Your doing a great job man, stay blessed!!! :")

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