Object in a vacuum

  • Thread starter Daagon
  • Start date
  • #1
1
0
Hey guys,

I have a question; I was in a Physics lesson at school today, me and my teacher got into a discussion about space and vacuums. Somehow we managed to get marsh mellows into te convosation, and my mind wondered until I came up with this question -

If a Marshe Mellow is traveling in a Vacuum (space), nothing can stop it, (an object in motion would stay in motion in a vacuum, as there is nothing to interfere). So if it them hit a larger object, like a Human, they would both have the same mass in space, so would the marshe mellow hit the human and take him/her along with it, or would the human act as an interference and slow the marshe mellow down?

Thanks guys!

-Samuel
 

Answers and Replies

  • #2
Mapes
Science Advisor
Homework Helper
Gold Member
2,593
20
Hi Daagon, welcome to PF. There's a physical law (called the conservation of linear momentum) that says that the total momentum (mass times velocity, mv) is constant in any isolated system. It's perfect for analyzing this question.

Say a human with mass [itex]m_H[/itex] is initially motionless, with zero velocity, and the marshmellow comes along with mass [itex]m_M[/itex] and velocity [itex]v_M[/itex] and sticks to the human. We can write

[tex]m_M v_M=(m_{M+H})(v_{M+H})[/itex]

because the total momentum is the same before and after the collision. Can you answer your question now?
 

Related Threads on Object in a vacuum

  • Last Post
Replies
10
Views
2K
Replies
20
Views
2K
Replies
18
Views
8K
Replies
4
Views
867
Replies
9
Views
21K
Replies
14
Views
929
Replies
2
Views
2K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
4
Views
818
Top