1. HW: No Homework Tonight
Bring in Paper Towel Rolls
Bring in cans of Tuna for the Turkey baskets
Notes Topic # 8 – THIS Will GO IN YOUR NOTES SECTION
Bellringer: Finish Gravity reading.
HW: Quiz tomorrow on Notes topic 5, 6 & 7

2. Newton’s Laws of Motion
Sir Isaac Newton

3. Newton’s First Law
The Law of Inertia

4. Newton’s 1st Law: Inertia
an object at rest will remain at rest unless acted on by an unbalanced force.
an object in motion will remain in motion unless acted on by an unbalanced force.

6. Examples-
Wearing a Seatbelt: object in motion
When a car comes to a sudden stop, a passenger without a seatbelt will keep moving until acted on by a force- the windshield.

8. Let’s take a look!

10. 2. Ball on a field: object at rest
A soccer ball at rest does not move unless acted on by a force- someone kicking it.

11. Inertia:
the tendency of objects to resist change in their velocity
The greater the mass of an object, the more inertia it has.

12. Which vehicle has more inertia? Why?
Tractor trailer
It has more mass so it takes more force to change its motion.

13. Let’s look at an egg demonstration…

14. Do the shopping carts have inertia?

15. Table Cloth Demonstration
Let Mr. S serve you!!!!

16. Cat Escape Video- An object in motion stays in motion!

17. Penny Activities… When you complete the penny activities
you should work on
#22- Newton’s First and Second Laws

18. The Law of Acceleration
Newton’s Second Law
The Law of Acceleration

19. Newton’s 2nd Law of Motion
The acceleration of an object is affected by the mass of the object and the force applied to the object.

20. A larger force results in greater acceleration.

21. In other words, an object with more mass will need more force to accelerate.

22. Which object would be harder to move, a bowling ball or golf ball
Which object would be harder to move, a bowling ball or golf ball? Explain your answer.
A bowling ball has more mass so it has more inertia.
The bowling ball will require more force to have the same acceleration as the golf ball.

23. Force= mass x acceleration F- force m- mass a- acceleration

24. Example-
If an object has a mass of 42 Kg and accelerates at a rate of 5 m/s2, how much force is applied?
F = m · a
F= 42Kg x 5 m/s2
F= Kg∙m/s2
F= N

25. If they push with the same force (10N), who will have a greater acceleration?
Person B
Mass= 65Kg
Person A
Mass= 80Kg
a = F ÷ m
a= 10N ÷ 80Kg
a= 0.1 m/s2
a = F ÷ m
a= 10N ÷ 65Kg
a= 0.2 m/s2
a = F ÷ m

26. Let’s look at the effects of force and mass on acceleration!

28. a = F ÷ m (Acceleration- m/s2) m = F ÷ a (Mass- Kg)
F = m x a (Force- N)
a = F ÷ m (Acceleration- m/s2)
m = F ÷ a (Mass- Kg)
Round to nearest tenth

29. Newton’s Third Law
Action & Reaction

30. Newton’s 3rd Law: Action- Reaction
For every action there is an equal and opposite reaction.
In other words, forces come in pairs.

31. How does a rocket take off?

32. Space Shuttle Launch 300N Action 300N Reaction Action:
rockets firing and pushing downward on the ground
Reaction:
shuttle moving upward
and lifting off of the
ground
Space Shuttle Launch
300N
Action
300N
Reaction

33. Space Shuttle Launch

34. Action Reaction (basketball player)
Label the action force and reaction force.
Fill in the missing force.
500 N
________________

35. Let’s do an example…
And I Push
If I push
Reaction
PUSH
PUSH
Action

42. Another Example:

44. Newton’s Cradle

47. Action

48. Reaction

51. Newton’s Cradle

52. any force that causes an object to move in a circular path
Centripetal force:
any force that causes an object to move in a circular path
means “center-seeking”

53. Examples: roller coaster

54. satellite orbiting Earth

55. The Great School Escape
Gym
Math Class
12a-2=
The Front Desk
(Start Here)
Deans Office
School Bus
French Class
POOLL
Cafeteria
Science Class

56. The Great School Escape
Gym
Math Class
12a-2=
The Front Desk
(Start Here)
Deans Office
School Bus
French Class
POOLL
Cafeteria
Science Class

57. The Great School Escape
Gym
Math Class
12a-2=
The Front Desk
(Start Here)
Deans Office
School Bus
French Class
POOLL
Cafeteria
Science Class

58. The Great School Escape
Gym
Math Class
12a-2=
The Front Desk
(Start Here)
Deans Office
School Bus
French Class
POOLL
Cafeteria
Science Class

59. 1- Front Office 7 – Deans Office 3 – Gym 7 – Math Class 5 – Pool
9 – French Class
3- Bus
1 - Cafeteria 7,