Could Lucy's Train Antics Really Happen According to Physics?

  • Context: Undergrad 
  • Thread starter Thread starter sandinmyears
  • Start date Start date
  • Tags Tags
    Love Physics Train
Click For Summary

Discussion Overview

The discussion revolves around the physics of a scenario depicted in the television show "I LOVE LUCY," where a character leaps in the air just as a train stops. Participants explore whether the physical consequences of such an event align with the laws of physics, considering aspects of motion, deceleration, and the effects on passengers during abrupt stops.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant asserts that if the train stops while a passenger is in the air, the passenger would continue moving forward due to inertia, potentially colliding with the wall of the train.
  • Another participant notes that trains take a significant amount of time to stop, suggesting that the duration of a human leap may not coincide with the train's stopping time.
  • A different participant acknowledges the uncertainty around the maximum deceleration of a train, indicating that various factors could influence the severity of the situation.
  • One participant draws on personal experience, stating that during hard braking, passengers continue their forward motion and could collide with the front of the vehicle, regardless of whether they are leaping or standing.
  • It is mentioned that the perceived force experienced by passengers during deceleration would be similar whether they are airborne or on the ground, although being on the ground might provide some ability to counteract that force.

Areas of Agreement / Disagreement

Participants generally agree on the principles of inertia and the effects of deceleration on passengers, but there is no consensus on the specifics of how dramatic the consequences would be or the exact dynamics involved in the scenario.

Contextual Notes

Participants express uncertainty regarding the maximum deceleration of trains and the time it takes for a train to stop, which could influence the discussion's conclusions. Additionally, the assumptions about the conditions of the train's stop and the nature of the leap are not fully defined.

sandinmyears
Messages
18
Reaction score
0
I was watching I LOVE LUCY and they were traveling on a train. Lucy kept pulling the emergency lever for various reasons. One of the times, Ricky was taking a leap up into the air and when the train stopped, he ran into the wall of the train because he was making the leap but the train stopped.

According to the laws of physics, would this actually happen?
 
Physics news on Phys.org
If the train stopped while he was still in the air, yes. If we suppose that the train before was going with constant speed than the passengers also go with that speed, so if it starts stopping you have to grab on to something to change your speed too, and if you are in the air at that time the wall will change your speed.
 
But it takes quite a while for a train to stop. A lot longer than the air time of a human leap.
 
Yes you are right although I don't know the maximum deceleration of a train and it depends on many factors I m sure it wouldn't be that dramatic.
 
In case of hard breaking of the vehicle, the passengers will continue their uniform forward motion and hit the front of the vehicle.
I'm sure you have experienced it yourself, maybe not in a train but in a bus or a car, but it's still the same thing. So I wonder why are you even asking such a trivial thing.

And it doesn't matter much if you leaped or not. If you are stepped on the floor you will have a better chance of countering the perceived force that pushes you forward, but that force itself will be the same strength in either case. And if it is big enough, even being stepped on the floor won't be much help to you.
 

Similar threads

  • · Replies 24 ·
Replies
24
Views
4K
Replies
31
Views
4K
  • · Replies 38 ·
2
Replies
38
Views
6K
Replies
90
Views
13K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 51 ·
2
Replies
51
Views
7K
  • · Replies 56 ·
2
Replies
56
Views
9K
  • · Replies 25 ·
Replies
25
Views
6K
  • · Replies 1 ·
Replies
1
Views
4K