*~ Application of Newton's 3rd Law ~*.
Whenever one object exerts a force on a second object, the second object will exert an equal and opposite force on the first object.
In order for this law to work, you must have two separate forces, and two different objects. This law says that when one object applies force to another, the other object will push back in the opposite direction or the first object. Friction is an example of this law. If you have a block, and you put it on a table, the weight of the block will be pushing down on the table. The friction of the table though, will be pushing up on the block with the same amount of force as the block is using to push down on the table. .
Another way to state Newton's third law would be to say that every action has an equal and opposite reaction. A firefighters fire hose is a good example of Newton's third law as well. The hoses have to have special handles on them, because when water shoots out of the hose, the hose itself is pushed backwards. .
A third example of Newton's third law is pool. When you are playing pool, if you hit the ball and the ball hits a wall, the ball will bounce back in the opposite direction. This is because we have two objects (the ball and the wall). The ball has the force of you hitting it. The wall, we know because of Newton's third law, exerts an equal force on the ball, causing it to bounce back like it will. .
Friction is a force that is equal to the coefficient of friction times the normal force. You can find the normal force using Newton's third law. Usually, the force of the first object equals its mass. Therefore, the force of the 2nd object is also equal to its mass, it is just acting in the opposite direction of the first object.
The key concept in this law is that action = reaction. .
In conclusion, Newton's third law says that for every action of an object, there is an equal, but opposite reaction on it from a 2nd object.