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Chapter 8

# Chapter 8 - Chapter 8 Forces on systems Newtons 3rd law...

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Chapter 8 – Forces on systems Newtons 3 rd law Every force occurs as one member of an action/reaction pair of forces The two members of an action/reaction pair act on two different objects The two members of an action/reaction pair are equal in magnitude but opposite in direction Consequence of Newton’s 3 rd Law: a closed isolated system cannot accelerate due to internal motions (the “no space-drive” theorem). How to do Draw each object separately. Place them in the correct position relative to other objects. Don’t forget to include objects like the earth that may not be mentioned in the problem. Identify every force. Draw the force vector on the object on which it acts. Label each with a subscripted label such as F A on B The usual force symbols, such as n and w can be used. Identify the action/reaction pairs. Force F A on B goes with force F B on A . Connect the two force vectors of each action/reaction pair with a dotted line. When you’re done, there should be no unpaired forces.

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