Newton's First Law straight line speed

AI Thread Summary
The discussion revolves around the concept of objects moving at constant speed in a straight line, referencing Newton's First Law of Motion. Participants explore whether any objects exist that maintain this condition indefinitely, noting that while light travels at a constant speed in a vacuum, it does not always follow a straight path due to gravitational influences. The conversation highlights that all objects with mass are subject to forces that can alter their velocity, such as the gravitational pull from nearby planets. There is a clarification that not everything in the universe has mass, but all objects are affected by forces. Ultimately, the discussion emphasizes the application of Newton's First Law to understand motion in the universe.
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Homework Statement


For my A-level homework I have to think whether there are any objects in the universe that move at the same speed in a staight line forever.


Homework Equations


I am stuck to think of anything - do any exist?


The Attempt at a Solution



Thanks for the help
 
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What about something with no mass?
 
that would not be possible.. everything in this universe has mass..

however light or any electro magnetic radiation for that matter, in vacuum, moves with the same speed(3x10^8 m/s) forever..
 
but objects such as meterorites in the universe change velocity because of mass of nearby planets - is this true?
 
You titled this "Newton's First Law". Perhaps that has something to do with this problem! What is Newton's first law?

By the way, it is not true that "everything in this universe has mass". In fact, you gave an example in the same post in which you said that. It is, however, true that everything is affected by force.
 
saiaspire said:
that would not be possible.. everything in this universe has mass..

however light or any electro magnetic radiation for that matter, in vacuum, moves with the same speed(3x10^8 m/s) forever..

But that don't move in a strait line...

or you consider classical mechanics and the speed of light is infinite but move in a strait line, or you consider G.Relativity and light travels at c but don't travel in strait path as there's gravity everywhere. ^_^

EDIT: but for the problem i guess that would be related with 1º law...so, is about direct applying it.
 

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