Inelastic collision problem

  • Thread starter garr6120
  • Start date
  • #1
garr6120
42
0

Homework Statement


I am doing this project and it asks me for the before and after velocity of a inelastic collision.

Homework Equations




The Attempt at a Solution


I have found the before velocity of both object which is 0 and 15 m/s, however i am trying to find the after velocities right now, the thing is they are not stuck together so their are two speeds. So far i have added my two momentum's to find the total momentum before collision. However, now i am stuck with a solution i cannot find.
 

Answers and Replies

  • #2
Satvik Pandey
591
12
Have you been given the value of the coefficient of restitution?
 
  • #3
Maged Saeed
105
3
I have found the before velocity of both object which is 0 and 15 m/s, however i am trying to find the after velocities right now, the thing is they are not stuck together so their are two speeds. So far i have added my two momentum's to find the total momentum before collision. However, now i am stuck with a solution i cannot find.

You have two equations , one for conservation of momentum and the other is for conservation of kinetic energy.
Because the kinetic energy is conserved in the elastic collision.
From them you can find the final velocities of the two objects.
 
  • #4
Maged Saeed
105
3
By the way , it is an elastic collision , not inelastic.
 
  • #5
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
38,325
7,886
You have two equations , one for conservation of momentum and the other is for conservation of kinetic energy.

it is an elastic collision , not inelastic.
The OP says it is inelastic, so work is not conserved. It may be that garr6120 has stated the problem incorrectly, but I see no reason to suppose so.
 
  • #6
Satvik Pandey
591
12
The OP says it is inelastic, so work is not conserved. It may be that garr6120 has stated the problem incorrectly, but I see no reason to suppose so.
Yeah! I too have doubt about that. But I think if the value of coefficient of restitution is given then that question can be solved even if the collision is inelastic.
 
  • #7
Maged Saeed
105
3
The OP says it is inelastic, so work is not conserved. It may be that garr6120 has stated the problem incorrectly, but I see no reason to suppose so.

Oh ,, I thought that it is elastic since the two object doesn't stuck together ,,
I was wrong
:)
 
  • #8
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
38,325
7,886
Oh ,, I thought that it is elastic since the two object doesn't stuck together ,,
I was wrong
:)
Right. To be honest, it has always seemed strange to me that 'elastic' is taken to mean perfectly elastic, i.e. no energy loss, and 'inelastic' for when there is any energy loss. It feels more natural to reserve inelastic for the case of zero coefficient of restitution and regard all nonzero restitution as varying degrees of elasticity. But there it is.
 
  • Like
Likes Maged Saeed
  • #9
Maged Saeed
105
3
I understand now, But in this question he didn't provide the coefficient of restitution .thus , the question is a little bit confusing .
 

Suggested for: Inelastic collision problem

  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
5
Views
3K
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
1K
Replies
1
Views
10K
Top