Balanced and Unbalanced Forces

How to write this in exams

1. 1

   Start with the exact idea

   Balanced forces have zero net force and do not change the state of motion, while unbalanced forces have non-zero net force and can change motion.

2. 2

   Then show how to use it

   Mark directions, subtract opposite forces, identify net force direction, then state whether motion changes.

3. 3

   Add one concrete example

   Two students push a box with 50 N each from opposite sides; the box does not move because the forces are balanced.

4. 4

   Avoid this incomplete answer

   Adding 70 N and 40 N as 110 N is wrong when forces act in opposite directions.