Stone Falling Motion: Debunking the Myth of Upward Acceleration in Reverse

  • Thread starter Thread starter TickleMeElma
  • Start date Start date
  • Tags Tags
    Acceleration
Click For Summary

Homework Help Overview

The discussion revolves around the motion of a stone falling and the implications of reversing a motion picture of this event. The subject area includes concepts of kinematics and acceleration.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore whether reversing a film of a falling stone changes the nature of its acceleration, with some questioning the validity of observations made when time is reversed.

Discussion Status

The discussion includes varying interpretations of the implications of running the film backwards, with some participants providing insights into the nature of acceleration during the motion. There is no explicit consensus, but productive dialogue is occurring around the topic.

Contextual Notes

Participants are considering the assumptions related to time and motion, as well as the effects of reversing a film on the perception of acceleration.

TickleMeElma
Messages
16
Reaction score
0
A motion picture is made of a stone falling down. It shows that the acceleration is downward. Now run the film backwards. It will show the stone accelerating upwards.

True or false?

I am not sure on this one...I think it is false, because if traced backwards, the stone is actually slowing down as it is reaching the top from which it was initially thrown. :confused:

Thanks so much everyone!
 
Physics news on Phys.org
You are correct. What the backwards film will show is a rising stone, but the acceleration will still be downwards since it slows down as it rises.
 
If you run the film backwards, time is running backwards an dso any observations are null.
 
You're just running the movie backwards, not the universe! :smile:
 
Thanks so much!
 
Doc Al said:
You're just running the movie backwards, not the universe! :smile:

Ah i interpreted traced as something else!
 

Similar threads

Rolling Motion (Stone Gets Stuck in a Tire Going Forward)
  • · Replies 10 ·
Replies
10
Views
2K
Finding proper value for centripetal acceleration in a plane rising up
  • · Replies 16 ·
Replies
16
Views
2K
How Do You Calculate the Meeting Point of Two Stones Thrown from a Cliff?
  • · Replies 1 ·
Replies
1
Views
2K
Acceleration of system related to rolling motion and pulley
  • · Replies 35 ·
2
Replies
35
Views
5K
What is the equation of motion for a launched spherical stone?
  • · Replies 12 ·
Replies
12
Views
2K
Opposing accelerations on stone drop/throw up problem
  • · Replies 6 ·
Replies
6
Views
4K
Calculating a ratio in Free Fall motion
  • · Replies 7 ·
Replies
7
Views
5K
Stone being tossed from mountain Uni Physics with Calc
  • · Replies 14 ·
Replies
14
Views
3K
When accelerating upward off a trampoline....
  • · Replies 7 ·
Replies
7
Views
4K
A falling stone takes 0.28 s to travel past a window 2.2 m...
  • · Replies 4 ·
Replies
4
Views
8K