1. Newton’s Laws of Motion

2. Newton’s Law of Motion says:
“In order to move an object with mass,
you need to apply a force”
The greater the mass = The greater inertia => more force is needed

3. Force
Force – push or pull and causes things to accelerate
1000 kg

4. Balanced vs. Unbalanced Forces
Balanced Forces - no acceleration in any direction
Unbalanced Forces – one force is greater than the other causing acceleration in a direction

5. Forces will cancel each other and produce NO ACCELERATION!
Balanced Forces
Object
5 N
5 N
Equal Pushing
Forces will cancel each other and produce NO ACCELERATION!

6. Balanced Forces If these football players push
on each other equally as hard,
will either one move?

7. Balanced Forces
Gravity pulls down on you, the ground pushes back up, KEEPING YOU WHERE YOU ARE!

8. Forces will not cancel each other out and produce ACCELERATION!
Unbalanced Forces
Object
10 N
5 N
Not Equal Pushing
Forces will not cancel each other out and produce ACCELERATION!

9. What is the net force and in what direction?
Net Forces
Object
10 N
5 N
What is the net force and in what direction?
(10 N) – (5 N) = 5 N to the right

10. What is the net force and in what direction?
Net Forces
Object
20 N
5 N
What is the net force and in what direction?
(20 N) + (5 N) = 25 N to the right

11. What is the net force and in what direction?
Net Forces
Object
15 N
30 N
What is the net force and in what direction?
(30 N) – (15 N) = 15 N to the left

12. What is the net force and in what direction?
Net Forces
Object
10 N
10 N
What is the net force and in what direction?
(10 N) – (10 N) = 0 N

13. Forces will not cancel each other out and produce ACCELERATION!
Unbalanced Forces
Forces will not cancel each other out and produce ACCELERATION!

14. Balanced vs. Unbalanced Forces
Video

15. First Law of Motion Inertia – resistance to the push/pull (force)
Newton’s 1st Law of Motion:
once in motion an object stays in motion - unless acted upon by another outside force
An object at rest stays at rest – unless acted upon by another outside force

16. Newton’s First Law and You
Because of inertia, objects (including you) resist changes in their motion. When the car going 80 m/hour is stopped by the brick wall, your body keeps moving at 80 m/hour.

17. Second Law of Motion Force = mass  acceleration (F = m  a)
Acceleration depends on the object’s mass and the force acting on the object
More Force = More Acceleration
More Mass = Less Acceleration

18. Second Law of Motion
If you apply more force to an object, it accelerates at a higher rate

19. Second Law of Motion
If the same force is applied to an object with greater mass, the object accelerates at a slower rate because mass adds inertia

20. Second Law of Motion

21. F m a Second Law of Motion
A car rolls down a ramp with a force of 2 newtons. The car has a mass of 0.5 kg. What is the acceleration of the car?
F = m  a
(2 N)  (0.5 kg) = 4 m/s2 F m a

22. Third Law of Motion
For every action there is an equal and opposite reaction
Upwards
motion
Downwards
force

23. Third Law of Motion

24. Third Law of Motion