physical science

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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 -

    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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