# What's the N3L pair here?

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#1
And why?
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2 years ago
#2
(Original post by Presto)
And why?
Something to do with the force pushing the water downwards, so water exerts a force pushing upwards i think.
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#3
(Original post by Shaanv)
Something to do with the force pushing the water downwards, so water exerts a force pushing upwards i think.
That's exactly what I thought! Glad to see I'm not the only one and I thought that due to that he rises but ms says
"There is a downward force on the (ejected) water
due to N3 the (ejected) water exerts an (equal and opposite) force on the flyer/jet pack"

So basically it's the ejected water and the flyer but why? And what about the two waters? So are there 2 N3L pairs in the diagram?
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2 years ago
#4
(Original post by Presto)
That's exactly what I thought! Glad to see I'm not the only one and I thought that due to that he rises but ms says
"There is a downward force on the (ejected) water
due to N3 the (ejected) water exerts an (equal and opposite) force on the flyer/jet pack"

So basically it's the ejected water and the flyer but why? And what about the two waters? So are there 2 N3L pairs in the diagram?
I think ur confused. The ms is just confirming what i said. Its just worded a little differently.

Not sure what u are getting at with your last few questions.
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#5
(Original post by Shaanv)
I think ur confused. The ms is just confirming what i said. Its just worded a little differently.

Not sure what u are getting at with your last few questions.
Is it? I wrote that the ejected water exerts a force on the sea so the sea exerts a force of the same magnitude in the opposite direction according to newton's third law due to which the flyer rises. Is this right or wrong? I don't think I get the mark scheme
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2 years ago
#6
(Original post by Presto)
Is it? I wrote that the ejected water exerts a force on the sea so the sea exerts a force of the same magnitude in the opposite direction according to newton's third law due to which the flyer rises. Is this right or wrong? I don't think I get the mark scheme
that is true, just refer your answers as simple and concise as newtons third law states
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#7
(Original post by Hassm100)
that is true, just refer your answers as simple and concise as newtons third law states
Is what I wrote the same as what the ms is saying?
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2 years ago
#8
(Original post by Presto)
Is what I wrote the same as what the ms is saying?
the ejected water exerts a force on the jet pack, you want to think of it as to why is he going up, the water hitting the sea is an irrelevant collision.
1
2 years ago
#9
(Original post by Presto)
Is what I wrote the same as what the ms is saying?
Not quite. Not sure if u would get the marks for what u are saying.

The jet pack exerts a downwards force on the water so the water exerts an equal and opposite force on jetpack.
1
#10
(Original post by Shaanv)
Not quite. Not sure if u would get the marks for what u are saying.

The jet pack exerts a downwards force on the water so the water exerts an equal and opposite force on jetpack.
(Original post by Hassm100)
the ejected water exerts a force on the jet pack, you want to think of it as to why is he going up, the water hitting the sea is an irrelevant collision.
Ok thank you both!
1
2 years ago
#11
(Original post by Presto)
That's exactly what I thought! Glad to see I'm not the only one and I thought that due to that he rises but ms says
"There is a downward force on the (ejected) water
due to N3 the (ejected) water exerts an (equal and opposite) force on the flyer/jet pack"

So basically it's the ejected water and the flyer but why? And what about the two waters? So are there 2 N3L pairs in the diagram?
There are no 'two waters'. Just so that you dont get confused, the ocean is not a factor in this situation
1
#12
(Original post by Afforestation)
There are no 'two waters'. Just so that you dont get confused, the ocean is not a factor in this situation
Yeah got it
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