Arslan
- 20
- 0
whats is the different between kienetic energy and momentum.with examples . i know the mathemetical formulaies..... the things that i want to get are the concepts.Thanks in advance.
Whats is the different between kienetic energy and momentum
Join the discussion
Registration is free. Start your own thread to ask a follow-up.
9 replies · 3K views
Discussion
Mentor
- 37,238
- 16,359
Energy is a scalar momentum is a vector. Energy and momentum have different units.
Mentor
- 23,902
- 11,357
There aren't really any nom-math concepts: the words are just names for the mathematical concepts!
Science Advisor
Homework Helper
Gold Member
Dearly Missed
- 10,165
- 138
What you need to understand, Arslan, is that mathematical concepts are not just as good as other types of concepts, most often, they are much better due to improved precision.
Thus, you need to develop mathematical thinking, i.e, understand the world in the terms of maths.
There is nothing "behind" you have to grasp by means of the maths, it is the maths itself you have to grasp&embrace.
Thus, you need to develop mathematical thinking, i.e, understand the world in the terms of maths.
There is nothing "behind" you have to grasp by means of the maths, it is the maths itself you have to grasp&embrace.
inline
- 14
- 0
The energy and momentum conservation laws are connected to time and space isotropy.
inline
- 14
- 0
Can you give me an example of non-mathematical concepts?arildno said:And are "conservation law" and "isotropy" non-mathematical concepts?
Mentor
- 23,902
- 11,357
Evolution.
Rap
- 829
- 11
If you want a kind of feel for momentum and energy, consider catching a baseball. Momentum is how much it makes your hand jump back when it hits, energy is how much it hurts when it hits. If you had a little marble, a baseball and a bowling ball hit your hand with the same momentum, they would make your hand jump back the same amount, but the marble would really hurt because it was traveling very fast and had more energy, the baseball less so, and the bowling ball hardly at all, because it would be moving slowly and have less energy.
Thats not the best example, because you might say the marble hurts because its smaller. But if you had a baseball filled with cotton, and one filled with lead, the cotton one would hurt more too, because it would really be traveling fast, while the lead one wouldn't hurt hardly at all, because it would be traveling so slowly. If the cotton ball weighed maybe an ounce and a baseball weights a half a pound, and the baseball hit your hand at 60 miles an hour, the cotton ball would have to hit your hand at almost 500 miles an hour to have the same momentum! That would hurt. If the lead ball weighed 5 pounds, it would only hit your hand at about 6 miles per hour, about as fast as a person walks.
Thats not the best example, because you might say the marble hurts because its smaller. But if you had a baseball filled with cotton, and one filled with lead, the cotton one would hurt more too, because it would really be traveling fast, while the lead one wouldn't hurt hardly at all, because it would be traveling so slowly. If the cotton ball weighed maybe an ounce and a baseball weights a half a pound, and the baseball hit your hand at 60 miles an hour, the cotton ball would have to hit your hand at almost 500 miles an hour to have the same momentum! That would hurt. If the lead ball weighed 5 pounds, it would only hit your hand at about 6 miles per hour, about as fast as a person walks.
Last edited: