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Homework Help: Newton's Third Law and a canoe

  1. Feb 2, 2016 #1
    1. The problem statement, all variables and given/known data
    Explain why when a person in a canoe throws a package onto the shore, the canoe moves away from the shore?

    2. Relevant equations
    No equations, just Newton's third law.
    3. The attempt at a solution
    I think it's because the person applies a force onto the package and the package applies a reaction force onto the person.This increases the force being applied to the canoe, which increases the force that the canoe is applying on the water. Thus, the water applies that same amount of force on the canow, pushing it forwards. Is this correct?
  2. jcsd
  3. Feb 2, 2016 #2


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    Science Advisor
    Homework Helper
    Gold Member

    You can stop there. That force pushes the canoe in a direction away from the shore. The water doesn't need to be considered. All it does is slow down (but not eliminate) the motion of the canoe away from the shore.
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