Physics question

[JohnnyEgo]

But he didn't want to use gravity in the original problem, rolling resistance requires gravity to hold the two surfaces together.

Guess you missed the first part of my prior post. If no external forces are applied to the balls, they continue to roll along at 20mph in perpetuity.
But Ray was really asking about the impact of weight (mass, really) on momentum for two otherwise equal objects. He just didn't use those words. The second part of my prior post answered that question.
The follow-up comment was for those who would argue about oversimplification of the model. It wasn't meant as a stand-alone post.

More to the point of what Ray was getting at, if you have two identical Kia Sephias travelling at 20 miles per hour, with one filled with feathers and the other with a equal volume of lead, and both drivers hit the brakes at the same time, the heavier one is going to take more energy to stop (rolls longer).

[00tec]

Guess you missed the first part of my prior post. If no external forces are applied to the balls, they continue to roll along at 20mph in perpetuity.
But Ray was really asking about the impact of weight (mass, really) on momentum for two otherwise equal objects. He just didn't use those words. The second part of my prior post answered that question.
The follow-up comment was for those who would argue about oversimplification of the model. It wasn't meant as a stand-alone post.

More to the point of what Ray was getting at, if you have two identical Kia Sephias travelling at 20 miles per hour, with one filled with feathers and the other with a equal volume of lead, and both drivers hit the brakes at the same time, the heavier one is going to take more energy to stop (rolls longer).

Which leads us to the next question: Which is heavier, an ounce of gold, or an ounce of feathers?

[davsel]

American or European ounce?

[spqrzilla]

Paging Galileo, paging Galileo. Mr. Galileo to the white courtesy phone....

[00tec]

American or European ounce?

I ain't European... haha

I'll add one:
Which is heavier, a pound of gold, or a pound of feathers?


It is a different answer....

[ray1970]

Lol. I was expecting maybe one or two replies. I had no idea this would lead to such entertainment.

Yes, I wasn't very good at explaining what I was trying to ask. Fortunately, JohnnyEgo has some experience dealing with kids so he figured out exactly what I was trying to ask.

[OtterbatHellcat]

African or European swallow?

Laden or unladen?

[Duman]

African swallow....

[cstone]

[Duman]

Two Kia Sephia's crashing? Can't think of a better ending for a Kia....