Solving for time in a frustrating dynamics question

  • Thread starter Thread starter Meeeessttteeehh
  • Start date Start date
  • Tags Tags
    Dynamics Time
Click For Summary

Homework Help Overview

The problem involves a car's emergency braking system and seeks to determine the time available for the driver to react before potentially entering an intersection. The context is within the subject area of dynamics, specifically focusing on deceleration and motion analysis.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the use of graphical methods to understand the problem better and suggest starting from the assumption that the car stops just before entering the intersection. There is also mention of the SUVAT equations as a potential tool for solving the problem.

Discussion Status

The discussion is ongoing, with participants exploring different approaches and questioning the clarity of the provided information. Some guidance has been offered regarding graphical methods and assumptions, but no consensus has been reached on a specific solution path.

Contextual Notes

There are indications of missing or unclear information in the original post, which may affect the ability to solve the problem effectively.

Meeeessttteeehh
Messages
19
Reaction score
4

Homework Statement


If a car has an emergency breaking system that can be pulled by the driver, which will decelerate the car at a rate of -4.0m/s^2, how long does the driver have to react before it is too late. (If she enters the intersection at all is it too late?)

Homework Equations


No idea, but lots of information already solved in previous questions... picture below.

The Attempt at a Solution


I have literally no idea. Any help is greatly appreciated!
Physics .JPG
 

Attachments

  • Physics .JPG
    Physics .JPG
    36 KB · Views: 378
Physics news on Phys.org
Sorry, the information you have provided is unreadable.
 
These sorts of problem are often more easily "grocked" using a graphical approach.

Hint: The area under a velocity versus time curve is the distance traveled.
 
Perhaps start by assuming the car stops just before entering the interaction and work back from there.
 
Have you ever hear of the SUVAT equations? One of these equations will allow you to solve this problem. Can you guess which one to use?
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
Replies
4
Views
2K
  • · Replies 10 ·
Replies
10
Views
7K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 15 ·
Replies
15
Views
6K
Replies
6
Views
4K
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
5K