Newtons third law, Mechanical Engineering

Problem - Newton's Third Law

Newton's Third Law of Motion states that if two objects interact, the force F12 exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force F21 exerted by object 2 on object 1.  Mathematically, F12  = - F21.  In other words, all forces occur in an action/reaction pair ("for every action, there is an equal and opposite reaction").

Fill in the blanks in the table below.  The first row is filled out as an example.





Object providing the force


Object acted upon by the force

Object providing the force


Object acted upon by the force

You lift a box off the ground


100 N j



-100 N j


A tugboat pulls a ship


2500 N i





A Toyota collides with a Honda





900 N i


You push against a wall

Your hands

130 N i





You push off the ground to jump

Your feet

-450 N j

The ground




A husky dog pulls a sled


250 N i + 200 N j





You throw a baseball


275 N i + 125 N k





Posted Date: 2/26/2013 4:23:08 AM | Location : United States

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