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Newton's Third Law says that all forces come in pairs that are equal
in strength but act in opposite directions http://physics.webplasma.com/physics01.html
Think about how it would feel if you kicked a concrete wall really hard.
You push against the wall with your foot. In the same way, the wall
pushes back with the same amount of force. That's why your foot hurts so
badly!
How do you think a rocket is launched? Think about Newton's third law.
For every action there is an equal and oppositely directed reaction. The
rocket pushes out large amounts of hot gases downward from the bottom.
In turn the rocket bursts upward toward the sky. The downward push from
the hot gases is an action so there must be a reaction. The reaction to
the gas being pushed out is the rocket being pushed in the opposite
direction. Rockets can function  thanks to Newton's third Law. http://www.grc.nasa.gov/WWW/K-12/airplane/newton3.html
Forces always come in pairs. They are called interaction pairs.
Interaction pairs are two forces that are opposite in direction but
equal in strength. The two forces must exist together or there is no
force at all. They both result from the contact between the two objects.
Reading List
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The Handy Physics Answer Book by P. Erik
Gundersen
Understanding Physics (3 Volumes In 1)
by Isaac Asimov |
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Video Instruction
*Availability of You Tube video links may vary. eTAP has no control of these materials.
 for Students, Parents and Teachers
Now let's do Practice Exercise 1-6 (top).
Summary
http://hyperphysics.phy-astr.gsu.edu/hbase/newt.html
http://en.wikipedia.org/wiki/Newton's_laws_of_motion
You have now completed Lesson 1 on Motion and Forces and are ready to do
the Problem and Test sections.
You may wish to review any or all of the topics before answering the
questions that follow. You may also wish to obtain additional material
from the links below before answering the questions. In addition, I’ve
provided the names of a few good books that will help with your
learning.
Good luck!
Understanding Physics (3 Volumes In 1) by Isaac Asimov
Next Page: Problems (top)
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