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# Is this the correct free body diagram? watch

1. Hi everyone

I have the information and the question .

My answers are but I am not confident that this is correct. So as we are not considering frictional forces, then there is only gravity to think of whilst the diver is still in the air? Also would it be better to make my axes just include j rather than j and i?
2. (Original post by kirsty456)
Hi everyone

I have the information and the question .

My answers are but I am not confident that this is correct. So as we are not considering frictional forces, then there is only gravity to think of whilst the diver is still in the air? Also would it be better to make my axes just include j rather than j and i?
Yes, if friction is ignored there is just one force, the downwards force of the diver's weight in that first phase.
As for the coordinate system, it would seem as though you are only interested in the vertical direction, as the question distinctly states that the diver's motion is vertical only.
By the way, you need units for the mass and speed of the diver, and the distance of the pool below the board.
I know it says they are all SI but they should still be included with the stated value.
3. (Original post by Stonebridge)
Yes, if friction is ignored there is just one force, the downwards force of the diver's weight in that first phase.
As for the coordinate system, it would seem as though you are only interested in the vertical direction, as the question distinctly states that the diver's motion is vertical only.
Thank you
4. (Original post by kirsty456)
Thank you
I've added a bit on to my post since you replied.
5. (Original post by Stonebridge)
I've added a bit on to my post since you replied.
Got it thanks

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Updated: November 19, 2013
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