Newton's Cradle

  • Thread starter HoloBarre
  • Start date
  • #1
7
0
I have asserted that Newton's Cradle does not demonstrate specifically that P = mv or that E = 1/2mv^2.

Rather, that it demonstrates only that two *different* laws of motion/conservation are simultaneously at work.

An alternative form of this assertion is that by observing Newton's cradle, you cannot *specifically* derive the above two equations, but rather only an infinite number of pairs of *consistent* equations.

Opinions?

Thanks,

HB
 

Answers and Replies

  • #2
461
8
I have asserted that Newton's Cradle does not demonstrate specifically that P = mv or that E = 1/2mv^2.
Those are mathematical formulations of the definitions of momentum and KE, therefore you don't have to "demonstrate" them.In the case of KE the formula can be derived from other definitions but in the end is still a definition.in the case of momentum p=mv and that is that.
Rather, that it demonstrates only that two *different* laws of motion/conservation are simultaneously at work.
HB
I always considered it a cool toy that shows the conservation laws.
An alternative form of this assertion is that by observing Newton's cradle, you cannot *specifically* derive the above two equations, but rather only an infinite number of pairs of *consistent* equations.
What pairs of equations are you refering to?
 

Related Threads on Newton's Cradle

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
4
Views
7K
  • Last Post
Replies
4
Views
1K
  • Last Post
Replies
8
Views
5K
  • Last Post
Replies
8
Views
3K
  • Last Post
Replies
7
Views
8K
  • Last Post
Replies
2
Views
9K
  • Last Post
Replies
4
Views
777
  • Last Post
Replies
23
Views
5K
Replies
13
Views
2K
Top