Why Speed Limit for Vehicle Skidding Independent of Mass

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Homework Help Overview

The discussion revolves around the physics of vehicle skidding and why the limiting speed for skidding is considered independent of mass. Participants explore the implications of mass in relation to speed limits for different types of vehicles, such as lorries and cars.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants question the relationship between mass and skidding speed, with some suggesting that other factors, such as weight distribution and road conditions, play a significant role. There are attempts to relate kinetic energy and frictional forces to the problem, while others express curiosity about the implications of mass on vehicle dynamics.

Discussion Status

The discussion is ongoing, with various perspectives being shared. Some participants have offered insights into the factors affecting skidding, while others are exploring the assumptions behind the independence of mass in this context. There is no explicit consensus yet, but the dialogue is productive.

Contextual Notes

Participants are navigating the complexities of vehicle dynamics, including the effects of mass, speed, and other variables. The original poster's urgency suggests a need for clarity on the topic, but the discussion remains open-ended with multiple interpretations being considered.

andrewtsoi34
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Skidding problem [Urgent]

Why the limiting speed of the venhicle without skidding is independent of its mass?

For example, why lorries may have to go at a slower speed than the 25m/s
limit for cars

But why this does't depend on the mass but the speed:confused:
 
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It's dependent upon a lot of things, not the least of which is mass. Other factors include weight distribution, tire compounds and quality, road surface conditions, etc.. I'll leave the details for others more versed in the matter.
 
andrew...if you have studied rotational motion and the parallel axis theorem then here is how it goes...snece the vehicle is rolling...the total kinectic energy possesed by it is .5mv^2+.5Iw^2...were i is the rotational inertia and w is rotational spped...since the i for wheels is .25mr^2..think u so...then..we can eqaute this to the firctional energy...which is equivalent to the friction force times the distance travelled...u know that frictional force is dependent on the mass of vehicle...hce...if we would equate these variable...mass would get canceled of!...
 
I love these "urgent" vehicular motion questions.

I imagine andrew furiously typing away on his laptop in the car. "Urgent! What is the braking distance on a 97 Chevy?"
Followed 20 seconds later by "Never mind..."
 
A lorry has a lower speed limit simply because it takes longer to stop normally. ( it probably stops just as quickly as any other vehicle if it hits a wall though... almost)
 

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