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# M1 AS general ques. Watch

1. in mechanics when something moves "relative" to something else e.g. velocity of ship relative to water is moving.... the water moves due east etc. do you draw the diagram so both are connected to each other or so they start from the same point (see diagram). Sorry for the bad diagram also if the question asks for the bearing of the ship is it like 1 or 2 on the diagram ...
2. (Original post by kiiten)
in mechanics when something moves "relative" to something else e.g. velocity of ship relative to water is moving.... the water moves due east etc. do you draw the diagram so both are connected to each other or so they start from the same point (see diagram). Sorry for the bad diagram also if the question asks for the bearing of the ship is it like 1 or 2 on the diagram ...
Can't see the thing you put there

but for example B relative to A means B-A
3. (Original post by Steelmeat)
Can't see the thing you put there

but for example B relative to A means B-A
? what do you mean by that. Like A is connected to the end of B? ill attach it again
4. (Original post by kiiten)
? what do you mean by that. Like A is connected to the end of B? ill attach it again
umm usually i don't draw diagrams of that stuff

but what they want you to do is

position vector of B take away the position vector of A
when the question says something which includes B relative to A
5. (Original post by Steelmeat)
umm usually i don't draw diagrams of that stuff

but what they want you to do is

position vector of B take away the position vector of A
when the question says something which includes B relative to A
Right, so would you answer this type of question by always doing b - a. then what about the bearing? will it always be the angle between a and b?
6. (Original post by kiiten)
Right, so would you answer this type of question by always doing b - a. then what about the bearing? will it always be the angle between a and b?
it would be of whatever wouldn't it???

i'm sure this powerpoint made by someone on the interwebs should help

http://www.ucl.ac.uk/~zcapf71/Mechan...j_notation.pdf

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