Posted by **anonymous** on Friday, December 31, 2010 at 2:30pm.

which of newton's laws (1, 2, or 3)are used in the following:

1) spaceship reaches the speed for orbit around the earth,

2) pushing the shuttle forward in space

3) the force needed to escape earth's atmosphere

- physical science -
**Damon**, Friday, December 31, 2010 at 5:18pm
1) F = m a #2

G m Me/r^2 = m v^2/r specifically

2) conservation of momentum #1

specifically:

mass remaining on craft * speed of craft + mass of exhaust * speed of exhaust (which is negative) = original mass of craft* original speed of craft

BUT

You can also say action = reaction

force of exhaust on rocket = force of rocket on exhaust - #3

3) well the important thing is law of gravity, but at every altitude F = m a

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