1. Net Force

2. A force is a push or a pull.
Forces
A force is a push or a pull.
Balanced Forces
Unbalanced Forces
There are always forces acting on objects, and these forces can be balanced or unbalanced.

3. Balanced forces are equal and opposite!
When forces are balanced, the forces are equal in size but working in the opposite direction.
Balanced forces are equal and opposite!

4. Balanced Forces
When forces are balanced, objects will remain motionless OR continue to move at constant speeds.

5. Unbalanced Forces
When forces are unbalanced, one or more forces are pushing/pulling harder than the others.

6. Unbalanced Forces Unbalanced forces cause objects to accelerate!
This means unbalanced forces cause objects to speed up,
slow down, or change direction!

7. Unbalanced Forces
It is very important that you understand that objects will only speed up, slow down, or change direction when they are acted on by unbalanced forces!

8. Net Force
To predict how forces will change the motion of an object, we must determine the
Net Force acting on the object.
4 N
2 N
4 N
2 N
Net Force = 6 N to the right
Net Force = 2 N to the right

9. Mass and Net Force
An object’s mass affects how much a force will change its motion. Mass tells us how much an object will resist a change its motion.
Objects with more mass are harder to speed up or slow down.
Objects with less mass are easier to speed up or slow down.

10. Mass and Net Force B A G F

11. Mass and Net Force A B