What are some examples of Newton's third (3rd) law?

[accelerate23]

If you want, could you give me at least 5 so that I can fully understand.

 

[johsun123]

http://74.86.200.109/showthread.php?t=285296Earlier physicsforums thread.

 

[azizlwl]

http://en.wikipedia.org/wiki/Newton_third_law

A ball hang by a string which attached to a ceiling.
The ball pull the string down, the string pull the ball up.
The string pull the ceiling down, the ceiling pull the string up

 

[emailanmol]

Newtons third law states that if an object A applies a force on object B (called action)

Object B applies an equal and oppsite force on object A (called reaction).

REMEMBER: Action and Reaction forces always act on different object.

IF ACTION ACTS ON B , then REACTION ACTS ON A.

Eg 1

The Earth pulls you by force mg towards it, you pull the Earth towards yourself with reaction force whose value is also mg.

Eg 2:
Cristiano Ronaldo applies a force on ball to kick it, the ball applies the same force on Ronaldo which is the reaction.

Eg 3:

When i pressed the key 3 on my keyboard with a force, the key pushed back on me with a reaction force.

Eg 4: this is an imp one.

a book rests on a table.
The Earth is pulling it down with force mg.
However, the table is applying an opposing force F which balances mg to keep the book at rest.

HOWEVER, THE FORCE F IS NOT THE REACTION FORCE TO mg.

remember, action and reaction always act on different objects.

Here both F and mg both act on A so they can't be action reaction pair.

In fact, The reaction force of mg on book by earth, is actually acting on earth.

The reaction of force F on book by table acts on table.

In this particular case F=mg which is why the book is at rest, but they are not action reaction forces.


Eg 5: Another imp one.

While walking we apply a force on Earth in backward direction with our feet.
Its reaction acts on us and pushes us forward making us walk.


Hope this helps.