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Optimal friction coefficient help? watch

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    The mass of the car itself is 900kg. It's balanced on 4 springs with it's weight evenly spread across all 4. People get on the car and they weigh 400kg. What's the optimal friction coefficient of the springs? And explain why?

    How do I do this? I'm not sure of which equation to use, I know friction is a force and is measured in Newtons. So do I use k=-F/x ? and make F=ma? What's the value for x?

    In the previous part of the question, the weight of the people was 90kg and I had to work out the constant (k) of the spring. But I don't think that's of any use because the k of this question will be different because of the different mass.
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    (Original post by Airess3)
    The mass of the car itself is 900kg. It's balanced on 4 springs with it's weight evenly spread across all 4. People get on the car and they weigh 400kg. What's the optimal friction coefficient of the springs? And explain why?

    How do I do this? I'm not sure of which equation to use, I know friction is a force and is measured in Newtons. So do I use k=-F/x ? and make F=ma? What's the value for x?

    In the previous part of the question, the weight of the people was 90kg and I had to work out the constant (k) of the spring. But I don't think that's of any use because the k of this question will be different because of the different mass.
    Whats the ****ing equation then, and then whats k aswell? see your question isnt very clear you see.
 
 
 
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