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Balanced Force:

Two boys (at each side of the table) pushing.

Unbalanced Force:

Pulling a cart

Two boys (at each side of the table) pushing.

Unbalanced Force:

Pulling a cart

example: you and I pull a crate at the same time with opposite direction with each has a force of 5 units.

(5 units for you)<--(balance)-->(5 unit for me)

N= fn + fg

= 5 units + (-5units)

= 0 units

do you think the object will move? the object will not move because when the sum of forces equate to zero so they're considered balanced. there is a equal of magnitude and opposite direction and lie along w/ the same line of action.

some example:

the hanging pen

the book on the table

(unless someone exert force on it)

Unbalanced force - force that causes the object in motion.

ex: again, supposed you and I pulling a crate at the same time, with the same forces applied.

(5 units for you )

(5 units for me )

(10 units) ---> unbalanced

N= fn + fg

= 5 units + 5 units

= 10 units

the sum of forces not equate to zero so the situation considered unbalanced because it would cause a change in motion.

other ex:

moving cart

falling pen

moving a book