Which Equation Should Be Used for Finding Maximum Constant Deceleration?

  • Thread starter Thread starter sandman203
  • Start date Start date
  • Tags Tags
    Deceleration Max
AI Thread Summary
To find maximum constant deceleration given initial speed, time to stop, and distance, the equation v = u + at is appropriate when displacement is not explicitly provided. However, if distance is given, it should correspond with the time and initial speed, suggesting a potential conflict in the problem statement. Both equations can lead to the same result under constant acceleration conditions, but clarity on the definitions of distance and displacement is crucial. The discussion emphasizes that if all parameters are consistent, there is only one value for constant deceleration. Understanding the relationship between distance and displacement is essential for solving the problem accurately.
sandman203
Messages
26
Reaction score
0

Homework Statement



Hi all this is just a quickie, but in one of my texts a question asks to find the maximum constant deceleration given an initial speed, time to stop and the distance it took.

Now I am not sure whether to use v = u + at or s = 1/2at^2 + ut

im thinking more v = u + at becuase I am not given displacement, I am given a distance.. any thoughts? cheers!
 
Physics news on Phys.org
Do both give the same answer?
 
If it's constant acceleration, and the given inputs are the initial speed and time to stop, there there is only one possible constant acceleration (deceleration). The maximum and minimum would be the same. I'm not sure why that was mentioned. It the distance to stop is also given, it either corresponds to the time, or else there's a conflict in the problem statement.
 
Why would you think, in this case, that displacement is not equal to distance?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Help with question on motion: Avoiding a rear-end collision
Replies
6
Views
3K
Irodov 1.23 confusion: Calculate distance traveled and time elapsed for this decelerating particle
Replies
2
Views
817
Calculating Separation of Cars in a Convoy Moving at Max Speed
Replies
4
Views
3K
Finding deceleration of a ball?
Replies
5
Views
2K
Max Speed to Move from Point A to Point B
2
Replies
53
Views
5K
Kinematics, Distance acceleration and deceleration.
Replies
6
Views
3K
Calculating Acceleration: Solving SUVAT and a Constant Homework Statement
Replies
9
Views
2K
Challenging Find maximum deceleration and speed (not max)
Replies
3
Views
2K
Two decelerating trains on a collision course
Replies
2
Views
2K
Find deceleration from distance and initial velocity
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top