1. Do Now: True or False? Justify!
If the net force on a body is zero, then its velocity will not change.
An unbalanced force on a body will always impact the objects speed.
The reason why initially moving objects tend to come to rest in our “everyday” life is because they are being acted on by unbalanced forces.
An unbalanced force on an object will always change the objects direction.
True
False (Skater on ice grabs a rope and swings in circles. This is true for velocity only.
True (Friction)
False (I can apply an unbalanced force in the direction it is moving and simply accelerate it in the same direction.)

2. Aim: How can we apply Newton’s Third Law?
Homework:

3. What happened when The shuttle count down got to zero? Why?
Using this information, how can you describe Newton’s Third Law?

4. Review – Newton’s 1st and 2nd Law
Newton's First Law - Inertia - An object at rest will stay at rest until a force acts on it. An object in motion will stay in motion until a force acts on it.
Newton's Second Law - The amount of force and mass an object has will determine its acceleration.

5. How can we describe Newton’s Third Law of Motion?
Forces come in pairs (twos)
Every force has an equal and opposite force
Every action has an equal and opposite reaction
3rd Law Force pairs happen on separate objects!!!

6. Examples of Newton’s Third Law1. 2.
Rocket
Boat
Person
Thrust

7. Force A push or pull on an object
Changes the STATE OF MOTION of an object
CONTACT FORCE
Physical interaction between objects
FIELD FORCE
“Action over a distance”
Example: Gravity (Weight)

8. Types of Forces- Free Body Diagram
Normal Force
A reaction force that is always PERPENDICULAR to the surface
Tension
Force in a string that PULLS an object
Friction
A retarding force that OPPOSES MOTION
Weight
Pull from gravity
ALWAYS STRAIGHT DOWNWARD
Draw a

9. Newton’s Law Activity
1. Using a Balloon, straw string and tape. Design an experiment where a balloon rocket is fired at the wall.
2. Calculate the force that the balloon hits the wall with.
3. How does every law apply???
4. Draw the free-body diagram