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# SMH help (car suspension over bumps) watch

1. The suspension of a car may be considered to be an ideal spring under compression.
When the driver, of mass m1, steps into the car, of mass m2, the vertical height of the car above the road decreases by x.
If the car is driven over a series of equally spaced bumps, the amplitude of vibration becomes much larger at one particular speed.

Explain why this occurs and find an expression for the separation, d of the bumps if it occurs at a speed of v .

im assuming "amplitude of vibration" just means resonant frequency
I can find an equation for spring constant k of the spring
but im not sure what to do next.
2. (Original post by Unicornman)
The suspension of a car may be considered to be an ideal spring under compression.
When the driver, of mass m1, steps into the car, of mass m2, the vertical height of the car above the road decreases by x.
If the car is driven over a series of equally spaced bumps, the amplitude of vibration becomes much larger at one particular speed.

Explain why this occurs and find an expression for the separation, d of the bumps if it occurs at a speed of v .

im assuming "amplitude of vibration" just means resonant frequency
I can find an equation for spring constant k of the spring
but im not sure what to do next.
well it means AT the resonant frequency. amplitude and frequency are different things.
3. not helpful
(Original post by Joinedup)
well it means AT the resonant frequency. amplitude and frequency are different things.
4. Adding the mass (weight) of the man decreases the distrance of the car above the road by x.

What does this tell you about the spring constant?

Once you have an expression for the spring constant you can use that, with the total mass to find the natural frequency of the system.
5. (Original post by astro-hannah)
not helpful
Neither is this ^

if you're having trouble with the same question - it's better to start a new thread rather than bumping an old one.

also better to avoid being critical of other people... especially if you're not going to offer anything better yourself... especially especially on old threads.

Dude could have (but didn't) follow up and we could have seen what (s)he was getting stuck on... people want to use this as a free, no-think homework doing service - that's actually not helpful cos at the end of the day they're going to be sat in the exam on their own.

examiner probably isn't going to give marks for answers that say frequency and amplitude are the same thing - so getting the nomenclature right at every opportunity is IMO important.

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