# Speed of a falling magnet in copper pipe

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#1
Hi everyone!

I don't understand how one would measure the final velocity of the magnet?
I thought maybe v=2s/t (suvat formulae, s=distance, t=time) but acceleration is not equal to a constant g is it?

Thanks!
Last edited by Geometrica; 1 year ago
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1 year ago
#2
(Original post by Geometrica)
Hi everyone!

I don't understand how one would measure the final velocity of the magnet?
I thought maybe v=2s/t (suvat formulae, s=distance, t=time) but acceleration is not equal to a constant g is it?

Thanks!
You would know why the acceleration is NOT constant when you learn electromagnetic induction.

You can measure the speed of the magnet using light gate sensors. See the following video.

You can also use tick tape timer.

I would leave the detail of the experimental setup to you.
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#3
(Original post by Eimmanuel)
You would know why the acceleration is NOT constant when you learn electromagnetic induction.

You can measure the speed of the magnet using light gate sensors. See the following video.

You can also use tick tape timer.

I would leave the detail of the experimental setup to you.
Yes I understand there will be a force on the magnet due to induction which reduces its acceleration. So would I place only one light gate at the bottom of the pipe, measure the length of the magnet and then use the time recorded between the front and back ends of the magnet? I don't know...?
Last edited by Geometrica; 1 year ago
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1 year ago
#4
(Original post by Geometrica)
… So would I place only one light gate at the bottom of the pipe, measure the length of the magnet and then use the time recorded between the front and back ends of the magnet? ....?
Not sure what are you asking here.
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#5
(Original post by Eimmanuel)
Not sure what are you asking here.
Is my 2nd method valid to determine final velocity (correct physics)? Sorry my brain is not working anymore
Last edited by Geometrica; 1 year ago
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1 year ago
#6
(Original post by Geometrica)
Is my method valid to determine final velocity (correct physics)? Sorry my brain is not working anymore
(Original post by Geometrica)
Yes I understand there will be a force on the magnet due to induction which reduces its acceleration. So would I place only one light gate at the bottom of the pipe, measure the length of the magnet and then use the time recorded between the front and back ends of the magnet? I don't know...?

What do you mean by front and back ends of the magnet?

How does the placing of one light at the bottom the pipe allow you to measure the speed of the magnet leaving the pipe?
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#7
(Original post by Eimmanuel)
What do you mean by front and back ends of the magnet?

How does the placing of one light at the bottom the pipe allow you to measure the speed of the magnet leaving the pipe?

Because the light gate will record the time during which the beam is broken right?
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#8
(Original post by Eimmanuel)
What do you mean by front and back ends of the magnet?
I mean just like the ends of the magnet, because it is a rectangle.
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1 year ago
#9
(Original post by Geometrica)
Because the light gate will record the time during which the beam is broken right?
Are you asking a question or making a statement?
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#10
Idk, I'm just not 100% sure if that is a valid method.
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1 year ago
#11
(Original post by Geometrica)
Idk, I'm just not 100% sure if that is a valid method.
(Original post by Geometrica)
Because the light gate will record the time during which the beam is broken right?
Indeed, the light gate will record the duration of the time that the magnet falls through the light gate. And you can have the length of the magnet divided by the duration of the time to find the average speed of the magnet leaving the pipe.
The tricky part is how are you going to quantify the average speed is the speed of the magnet leaving the pipe the pipe.

In certain examination board, students don’t need to quantify it but in certain examination board, students need to quantify it.
1
#12
(Original post by Eimmanuel)
Indeed, the light gate will record the duration of the time that the magnet falls through the light gate. And you can have the length of the magnet divided by the duration of the time to find the average speed of the magnet leaving the pipe.
The tricky part is how are you going to quantify the average speed is the speed of the magnet leaving the pipe the pipe.

In certain examination board, students don’t need to quantify it but in certain examination board, students need to quantify it.
Thanks for the help. I'm doing CIE, and I think it should be okay.
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