1. Why does everything in the universe move?
The question is…
Why does everything in the universe move?

2. Big, huge, massive forces!
The answer…
Big, huge, massive forces!
And little ones too.

3. Forces PG 39 A force is a pull (an attraction)
Or, a push (a repulsion)

4. Forces PG 39 All forces have two properties: Direction Size
A newton (N) is the unit that describes the size of a force and is equal to 1kg X m/s2

5. Newton’s Laws of Motion
Newton lived from 1642–1727
Law #1 An object in motion stays in motion and an object at rest stays at rest unless acted upon by an unbalanced force
Law #2 Force equals mass times acceleration (F = ma)
Law #3 For every action there is an equal and opposite reaction.
BrainPoP- Newton’s Laws of Motion 5

6. Newton’s First Law
An object in motion stays in motion and an object at rest stays at rest unless acted upon by an unbalanced force
Page 39 (notebook) 6

7. Observe the Effects of Inertia (Mini Lab Demo) Page 38 (notebook)
Procedures and Materials:
Data and Observations:
Analysis:
Identify the forces acting on the object in the cart in both runs.
Explain why it is important to wear safety belts in a car.

8. 1. Identify the forces acting on the object in the cart in both runs.

10. Newton’s First Law Page 38 (notebook) What does this mean?
An object will keep doing what it’s doing UNLESS acted on by an unbalanced force like friction
If it is moving at a constant velocity it will continue
If it is at rest, it stays at rest
Page 38 (notebook) 10

11. Newton’s First Law with Seat Belts
Don’t let this be you
Due to inertia, objects (including you) resist changes in their motion. When you and the car going 80 km/hour is stopped by the brick wall, your body keeps moving at 80 km/hour

12. Net Force (Resultant Force)
An object with a net force of anything other than 0 N on it will change its state of motion.
Page 39 (notebook)

13. Forces in the Same Direction
When forces are applied in the same direction, they are added to determine the size of the net force
Page 39 (notebook)

14. Forces in Different Directions
When two forces act in opposite directions, you subtract the smaller force from the larger force to determine the net force
The net force will be in the same direction as the larger force
Page 39 (notebook)

15. Balanced Forces Page 39 (notebook)
Balanced forces cancel each other out! They are forces that are equal in size and opposite in direction
Is there motion? Or force? External forces acting upon them?