Thread: another physics question (momentum)

  1. #1
    Unregistered Leeman_s's Avatar
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    Oct 2001

    another physics question (momentum)

    alright, so i have a car's mass, its velocity, and the time it took the car to come to a complete stop.

    ex: a car 1200 kg going 30 m/s takes 30 seconds to come to a stop (i'm not sure if thats realistic but just bear with me)

    OBJECTIVE: calculate the impulse.

    i know its just a simple calculation. I know impulse equals the force (newtons) times the change in time. But All I have is the above information, I don't know how many newtons it is.

    Would I just do grams x time? I know?

  2. #2
    Funniest man in this seat minesweeper's Avatar
    Join Date
    Mar 2002
    This page will help you

    You have the mass, m, the change in velocity, delta v, and the change in time, delta t. So it's just a case of sticking in the numbers and turning the handle (As it happens you don't even need all the info you have been given, which is always a nice position to be in ).
    Last edited by minesweeper; 12-22-2003 at 09:55 PM.

  3. #3
    Registered User axon's Avatar
    Join Date
    Feb 2003
    think about it this way....newtons is a unit of force, and force = mass*acceleration ...everything else is just plugging in numbers

    some entropy with that sink?

    there are two cardinal sins from which all others spring: Impatience and Laziness. - franz kafka

  4. #4
    Super Moderator VirtualAce's Avatar
    Join Date
    Aug 2001
    And to add my 2 cents this is a very common physics problem many of us encounter in game programming. Very useful - most of physics is when it comes to games.

    So jot the formula down somewhere because you'll probably use it again if you ever want to code some type of collision response in C.

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