# Newton's First Law

1. Oct 15, 2014

### lightbender

For Newton's first law, which one is correct?

1. All objects that are at rest, stay at rest; all objects that are in motion stay in motion, unless acted upon an unbalanced force.

Or

2. All objects that are at rest, stay at rest; all objects that are in motion stay in motion, unless acted upon an outside force.

Thank you!

2. Oct 15, 2014

### phinds

What do you think and why? It is not the purpose of this forum to spoon-feed answers. You need to make some effort yourself.

3. Oct 15, 2014

### lightbender

This is not a homework question!
I am just confused because some websites say number 1 while others say number 2

4. Oct 15, 2014

### dipole

explain the difference between the two statements. What does an "outside force" mean, and what would an "unbalanced force" be?

5. Oct 15, 2014

### lightbender

I do not know!

6. Oct 16, 2014

### sophiecentaur

It is only 'words' that you appear to have a problem with.
Start from the standpoint that Newton One is probably right (go to a third source, perhaps) and see which of those two alternatives could be 'wrong' or just a strange way of putting it, in your view. Try to reconcile them together rather than looking for a wrong one.

7. Oct 17, 2014

### bobie

The two sentences are identical but for an adjective, unbalanced is not appropriate, according to Newtons original formulation outside/ external is more appropriate: