* Forces always come in pairs: Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This means forces always occur in pairs, and those pairs are equal in magnitude.
* Forces can vary: The size of forces can be different depending on the situation. For example, the force of gravity on a small object is much smaller than the force of gravity on a large object.
To give you a better answer, I need more information. What kind of situation are you thinking of?
For example, are you thinking about:
* Forces acting on a single object: Like the force of gravity pulling down on a book and the force of the table pushing up on the book.
* Forces acting between two objects: Like the force of a bat hitting a ball.
Once I know the context, I can give you two forces that are not equal in size.
