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# Mechanics Watch

1. The first marking point refers that direction of initial motion is different from the direction of force on the stack. How come? Any thoughts would be appreciated

2. Seems to be suggesting an oblique (or glancing) impact... the point of contact is not in a straight line with the centres of mass of the colliding coins.
3. (Original post by Joinedup)
Seems to be suggesting an oblique (or glancing) impact... the point of contact is not in a straight line with the centres of mass of the colliding coins.
yeah i got you.

Can I use this diagram to illustrate the point?

labeling red as momentum given from stack on the flicked coin, brown as initial momentum while moving, and the orange as resultant momentum.

Thanks a bucnh
4. (Original post by Daniel Atieh)
yeah i got you.

Can I use this diagram to illustrate the point?

labeling red as momentum given from stack on the flicked coin, brown as initial momentum while moving, and the orange as resultant momentum.

Thanks a bucnh
Q seems to just be after a text only answer tbh
5. (Original post by Joinedup)
Q seems to just be after a text only answer tbh
yes they want a text here, but the idea is correct right?
6. (Original post by Daniel Atieh)
yes they want a text here, but the idea is correct right?
well I think you want one arrow for momentum 'before' and two arrows for momentum 'after'

and you want to show that momentum has been conserved so the two shorter arrows should add up to the 'before' momentum vector.

and you add vectors by putting one after the other head to tail - so I think you've got a vector pointing the opposite direction there.
7. (Original post by Joinedup)
well I think you want one arrow for momentum 'before' and two arrows for momentum 'after'

and you want to show that momentum has been conserved so the two shorter arrows should add up to the 'before' momentum vector.

and you add vectors by putting one after the other head to tail - so I think you've got a vector pointing the opposite direction there.
perfect, as always.

Thank you

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