# Which has more momentum, a 26 KG car at rest or 9 KG car driving at 351 mi/h

makivka 2011/12/12 22:02:05
Related Topics: Car, Driving
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• BoomLover 2012/01/02 03:24:23
Discounting the momentum of the Earth as it circles the Sun, the 26Kg car is stationary, therefor not generating any momentum. while the 9Kg car is traveling at 351 mph (mp/h) (Actual movement). Weight has no bearing on the equation, except that they bot have to have some weight for gravity to hold them on the surface. The real question is who drives a 26Kg, or a 9Kg car?
• Capn Ameruhka 2011/12/14 19:02:09
are talking as if the car at "rest" is moving due to the earth's rotation? or in terms of reality?
• Playerazzi 2011/12/13 13:51:49
Weird question, dude.

Momentum is mass times velocity (P=M*V)

So, 26Kg*0 is bigger or smaller than 9Kg*561Km/hr (switched miles to km's) ?

How much is something times Zero?

The answer is the 9Kg car.

And don't get funny with me about the 26kg car at rest on the surface of Earth actually travelling at 1000mi/hr because of the rotation of the Earth, and the OTHER car is actually going west (against the rotation of the Earth), so its momentum is lower. Sheesh. KISS (=Keep It Simple, Stupid).
• cddjmikey 2011/12/12 23:23:43
As everyone with a brain here is saying you have to be moving to have momentum.
• Matt 2011/12/12 22:37:39
Anything "at rest" has no momentum. In calculating acceleration or braking energy, the mass is halved and multiplied by the square of the velocity.

e = 1/2mv2
• shygurl 2011/12/12 22:31:25
the second one!!:D
• Kristen Lynn 2011/12/12 22:21:24
the second one right? cuz the first one isn't moving and so it has no momentum.
• xXmarìsaXx 2011/12/12 22:09:04
the second one
• Eddie 2011/12/12 22:08:17
There would need to be some movement to have momentum, me thinks!
• doctorwhofan~Tatae~BN-4 2011/12/12 22:05:04
I think things at rest don't have any momentum.

Fun

2013/05/21 07:48:41