Elastic collision problem
I’m struggling to understand how to solve this problem, I’ve attached my working out below. Any help would be appreciated
Attachment not found
Attachment not found
I still need help, I can’t figure out what I’m doing wrong
Original post by simon0
"Attachment Not Found" is displayed for both links in your original post.
Sorry, I’ve attached it again (and an imgur link for backup). I stopped my working out there as I’m 99% sure that I’ve done something wrong in that first part
https://imgur.com/HX7dFI9
(edited 4 years ago)
Looks ok, so the velocity of the first body after the collision is ...
https://en.wikipedia.org/wiki/Elastic_collision
Its a simple example of Newtons cradle
https://en.wikipedia.org/wiki/Elastic_collision
Its a simple example of Newtons cradle
(edited 4 years ago)
Original post by mqb2766
Looks ok, so the velocity of the first body after the collision is ...
https://en.wikipedia.org/wiki/Elastic_collision
Its a simple example of Newtons cradle
https://en.wikipedia.org/wiki/Elastic_collision
Its a simple example of Newtons cradle
But when I go further with the algebra it all falls apart. The equations I got just look wrong too.
Squaring the momentum equation and equating to the KE equation you should get
2uv = 0
for the velocities after collision, so one of them is zero. As the links describe, same mass bodies simply swap momentum (velocity), so the first body is zero, then second body is the initial speed (as in newton's cradle).
2uv = 0
for the velocities after collision, so one of them is zero. As the links describe, same mass bodies simply swap momentum (velocity), so the first body is zero, then second body is the initial speed (as in newton's cradle).
Original post by mqb2766
Squaring the momentum equation and equating to the KE equation you should get
2uv = 0
for the velocities after collision, so one of them is zero. As the links describe, same mass bodies simply swap momentum (velocity), so the first body is zero, then second body is the initial speed (as in newton's cradle).
2uv = 0
for the velocities after collision, so one of them is zero. As the links describe, same mass bodies simply swap momentum (velocity), so the first body is zero, then second body is the initial speed (as in newton's cradle).
Oh okay, I got that result yesterday when I worked it out (attached below). But I thought that couldn’t be right… especially as it says ‘leave your answer in terms of u and m’. But yup 0 worked… Thanks for your help again
Original post by maddy boy
is physics hard
Not a level physics (so far at least), just some Isaac physics questions I find very tricky!
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