what law that means... every action has an equal reaction?

Answer 1

Newtons third law.

Answer 2

The subsequent development of physics owes much to Newton’s laws of motion, notably the second, which states that the force needed to accelerate an object is proportional to its mass times its acceleration. If the force and the initial position and velocity of a body are given, subsequent positions and velocities can be calculated, although the force may vary with time or position (in which case, Newton’s calculus must be applied). This simple law contained another important aspect: each body has an inherent property, its inertial mass, which influences its motion. The greater this mass, the slower the change of velocity when a given force is applied. Even today, the law retains its practical value, as long as the body is not very small, not very massive, and not moving extremely rapidly. Newton’s third law, expressed simply as “for every action there is an equal and opposite reaction”, recognizes, in modern terms, that all forces between particles come in oppositely directed pairs.

Answer 3

Newton's Third Law- every action will have an equal and opposite reaction

Answer 4

Newton's Third Law

Answer 5

haha, relativity. That's a good one. That law is relative to force, but it's not relativity. Its' Newton's third law, one of the most confusing laws for intro physics students. This law means that if A pushes on B with a force, then B pushes on A with the same force. IT SAYS NOTHING ABOUT THE MOTION OF THE TWO OBJECTS. For example, if you push on a wall, the wall doesn't move because its glued to the ground. But you do move, because the wall pushes back on you by Newton's third law. This is more evident if you are skating: when you push off of your instructor (if you do), you both move. (well, also conservation of momentum, meh).
The thing to remember is that this law allows one to say that there are opposite forces acting in different directions, but NOT ON THE SAME OBJECT. Thus, they do not cancel out. Forces only cancel if they act on 1 object and are parallel and opposite to each other.

Answer 6

Newton's third law of motion states that to every action, there is an equal and opposite reaction.

http://wintheworld.wetpaint.com/page/The+Laws+Of+Motion

Answer 7

Isaac Newtons "Third Law" of motion.

Answer 8

3rd law of Motion of Sir Isaac Newton (Law of Interaction)

Answer 9

Newton's third law of motion.

Answer 10

ITS NEWTONS THIRD LAW OF MOTIONS..........FOR EXAMPLE: 1)IF U THROW A BALL AGAINST A WALL THE BALL RETUNS TO U WITH THE SAME PACE, 2)WHEN U R IN A BOAT THE MAN RIDING THE BOAT PUSHES THE WATER BACK EN THE BOAT MOVES IN FORWARD DIRECTION.....K HOPE UNDERSTOOD :-)