What is the deceleration and duration of a car skidding at 60 mi/h?

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In summary, the conversation is about solving a physics problem involving a car that skids after its brakes are applied. The goal is to find the deceleration and time of the skid using known variables and kinematic equations. The suggested equations to use are D=T(vf+vi)/2 for time and v^2=u^2+2ad for acceleration.
  • #1
mailman85
Please help me with this problem. I have tried many things to solve it, but there doesn't seem to be enough supplied information. I'm sure I'm just overlooking something. Thanks.

A car traveling at 60mi/h (88ft/s) skids 176 ft after its breaks are suddenly applied. Under the assumption that the braking system provides constant deceleration, what is that deceleration? For how long does the skid continue?
 
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  • #2
Hi mailman85, welcome to Physicsforums!

First this problem is suppose to be at the Physics section.

Anyway.

First, identify all the known variables. Then identify all the five kinematics equations. Now plug the known variables into one of the kinematic equation.

One thing you have to make sure is that the direction of the acceleration is negative.
 
  • #3
You can use the following equation for acceleration. You know the initial speed the final speed and the distance. That is enough to solve for both time and acceleration.

D=T(vf+vi)/2 can be used to find time.

You should be able to find the equation for for acceleration.

hope this helps
 
  • #4
Try v^2 = u^2 + 2ad
 

1. What is deceleration?

Deceleration is the rate at which an object's velocity decreases. It is measured in meters per second squared (m/s²) in the metric system or feet per second squared (ft/s²) in the imperial system.

2. How is deceleration related to skidding?

Deceleration is directly related to skidding, as skidding is a form of deceleration. When a car skids, its velocity decreases due to friction between the tires and the road surface.

3. What factors affect the deceleration of a car skidding at 60 mi/h?

The deceleration of a car skidding at 60 mi/h can be affected by factors such as the type of tires, road conditions, and the weight and speed of the car. The coefficient of friction between the tires and the road surface also plays a significant role in determining deceleration.

4. What is the duration of a car skidding at 60 mi/h?

The duration of a car skidding at 60 mi/h can vary depending on the factors mentioned above. It can range from a few seconds to several seconds, depending on the speed and distance covered by the car before coming to a complete stop.

5. How can the deceleration and duration of a car skidding at 60 mi/h be calculated?

The deceleration of a car skidding at 60 mi/h can be calculated using the formula a = (v^2 - u^2)/2s, where a is the deceleration, v is the final velocity (0 mi/h in this case), u is the initial velocity (60 mi/h in this case), and s is the distance covered during skidding. The duration can be calculated by dividing the final velocity by the deceleration.

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