1. What are balanced & unbalanced Forces??

2. Unbalanced force(seesaw)
A seesaw can show balanced & unbalanced forces.
If the weight of 1 end of the seesaw is greater than the weight of the other end, the heavier end moves down.
If the weight on both ends are the same, the forces are balanced and the seesaw doesn’t move.

3. Net Force
Net force: is the combination of all the forces acting on an object.
You don’t need to know all the details of all the forces acting on an object to know how the object will move.
You just need to know the net force.
When the forces are balanced the net force= “zero”.

4. Net Force
When you watch 2 children trying to pull a toy in opposite direction.
If both pull with equal strength, their forces are balanced.
The net force is “0”, so its motion doesn’t change.
The net force on each child is also “0” so they stay where they are.
Sometimes the net force isn’t zero, forces are unbalanced and motion changes.

5. Net Force A net force acting on a stationary object will move
the object.
If all the forces acting on an
object are in the same direction
simply add the forces together

6. Net Force Force acting in 1 direction is assigned a plus (+) sign.
Forces acting in the other
direction get a minus (_).
Add the strengths of the forces
to get the net force.

7. Difference between Balanced & Unbalanced forces