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Mao:

--- Quote from: sxcalexc on January 17, 2008, 10:16:08 pm ---Hmm question - about the way questions are worded. It says the 'speed' is 5ms but then it gives the direction ie. due south. So would we count this as a vector - and thus count acceleration as a vector when questions are worded like this, ALWAYS?

--- End quote ---
pretty much.... =S

cara.mel:
Afterthought that's been touched on:
These questions will always test you on vectors. Objects tend to enjoy either travelling due north or due south. In a proper answer (vs a lazy answer) you first say something like 'let north direction be positive' and ALWAYS chuck the direction in your final answer.
When they don't give you directions like that, eg the rifle question, still call one way positive and the opposite way negative.
Yes it gets boring and yes it is obvious but if you get in the habit now you won't accidently forget about it.

When you get up to projectile motion you'll be doing a similar thing as well (stating at the start up == positive direction)

Edit: So if you're really bored at school, make your directions the opposite way to what is 'normal' during tests etc. They can't mark you wrong :P

sxcalexc:

--- Quote from: caramel on January 18, 2008, 09:26:25 am ---Afterthought that's been touched on:
These questions will always test you on vectors. Objects tend to enjoy either travelling due north or due south. In a proper answer (vs a lazy answer) you first say something like 'let north direction be positive' and ALWAYS chuck the direction in your final answer.
When they don't give you directions like that, eg the rifle question, still call one way positive and the opposite way negative.
Yes it gets boring and yes it is obvious but if you get in the habit now you won't accidently forget about it.

When you get up to projectile motion you'll be doing a similar thing as well (stating at the start up == positive direction)

Edit: So if you're really bored at school, make your directions the opposite way to what is 'normal' during tests etc. They can't mark you wrong :P

--- End quote ---

Haha thanks, but I don't think i'll take the risk to try that little exercise at the bottom :P

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