This is a physics textbook conceptual question, please help! thanks!
2007-11-21 00:59:36 · 10 answers · asked by Kiwikahuna 2 in Science & Mathematics ➔ Physics
Momentum is conserved in the absence of a net external force. Moving objects slow down because of an external force of friction.
2007-11-21 01:05:29 · answer #1 · answered by Madhukar 7 · 3⤊ 0⤋
When you hit the brakes in a car, the car's momentum is transferred to the earth. The earth is so massive, that the additional momentum changes the earth's rotation only a tiny imperceptible amount. In any case, it is probably cancelled out by some other car stopping in the opposite direction, or accelerating in the same direction. As the others said, air can also absorb momentum. At first, that results in a noticeable movement of air. When a fast car goes by, you can feel a rush of air. Over time it spreads out over a large mass of air and results in just a slow movement. And again, it gets cancelled out by a rush of air from the opposite direction.
2016-04-05 01:39:19 · answer #2 · answered by Anonymous · 0⤊ 0⤋
The objects moving along the ground transfer their momentum to the molecules of the soil and comes to rest. Similarly the objects moving through air transfer their momentum to the air molecules. The total momentum remains the same in either cases.
2007-11-21 01:18:02 · answer #3 · answered by raj 2 · 2⤊ 0⤋
Objects slow down and stop do to friction. Momentum is conserved if no other force acts upon it.
2007-11-21 01:04:02 · answer #4 · answered by Kuba O 1 · 1⤊ 0⤋
In all real-world applications there is friction. Air, road surface, water, even oil all provide friction which converts some of the energy of your moving object into heat and slows it down.
2007-11-21 01:09:23 · answer #5 · answered by Allison R 3 · 1⤊ 0⤋
Friction and gravity can both slow momentum. Gravity if you throw a ball straight up in the air for instance.
2007-11-21 01:09:45 · answer #6 · answered by Joan H 6 · 1⤊ 0⤋
the law of conservation of momentum is applicable ideally in isolated system ,.
in real life the we observe things stop after collision
due of :
force of friction with the ground and b/w the bodies .
also both bodies are non ellastic.
2007-11-21 01:15:53 · answer #7 · answered by ilfu 1 · 0⤊ 0⤋
Momemtum IS conserved. The things stop due to friction. Due to friction, heat is generated. This heat does not remain in the same place but spreads in the atmosphere.
Thus, momemtum IS conserved.
2007-11-21 02:43:31 · answer #8 · answered by Super Answerer 3 · 0⤊ 0⤋
When moving object slows down and stops, something else accelerates, and comes into motion.
Namely planet earth.
2007-11-21 03:45:39 · answer #9 · answered by Alexander 6 · 0⤊ 0⤋
Those objects are not moving in a vacuum.
2007-11-21 04:17:55 · answer #10 · answered by johnandeileen2000 7 · 0⤊ 0⤋