1. Newton’s 1st Law
Law of Inertia

2. Question?
What is Newton’s first law of motion?

3. The Law of Inertia
The LAW OF INERTIA is Newton’s FIRST law of motion.

4. Newton’s Law of Inertia
What does the Law of Inertia say?
An object in M______ will remain in M______; An object at R______ will remain at R_____, until acted upon by a N___ F_____.
otion
otion
est
est et
orce

5. What is inertia?
Inertia- the tendency of an object to resist any change in its M______.
otion

6. Inertia
The inertia of an object is related to its MASS. The GREATER the MASS the GREATER the I_____.
Mass is the amount of MATTER an object has.
nertia

7. Does a bowling ball have the same inertia as a tennis ball? Why?
Question?
Does a bowling ball have the same inertia as a tennis ball? Why?

8. The Law of Inertia at Work!
The penny is at rest and wants to remain at rest. When the string on the card is pulled with enough force, the penny will REMAIN AT REST.

9. The dishes are at rest and want to remain at rest
The dishes are at rest and want to remain at rest. When the table cloth is pulled with enough force, the dishes will REMAIN AT REST.
PULL

10. The Law of Inertia at Work!
An object in motion wants to stay in motion. The person in the car is traveling at the same velocity as the car. When the car stops, the person wants to STAY IN MOTION. That is why you must wear your seatbelts!

11. The Law of Inertia at Work!
An object in motion wants to stay in motion. The test tube and the skateboard it is on is traveling at the same velocity. When the skateboard is stopped, the test tube wants to STAY IN MOTION.

12. Force = Mass X Acceleration F = m X a
Newton’s Second Law
Force = Mass X Acceleration
F = m X a

13. Observe what is going on in the picture?

14. Identify at least 5 forces taking place in the picture below.
Downward force of gravity
Boy pulling on rope and rock
Rock pushing down on table
Friction between rock and table and rope and hands
Table pushing up on rock

15. What do you believe the relationship is between mass and force?

16. The relationship between mass and force….
The more M______ an object has the more F______ required.
ass
orce

17. The relationship between mass and force….

18. Question….
If Marge applied the same amount of force to the grocery carts below, which will accelerate the slowest? Why?

19. The relationship between mass and acceleration….
The more M________ an object has the less it will A ___________.
ass
ccelerate

20. The relationship between mass and force….
Acceleration

21. Newton’s Second Law says…….
If you apply a F_____________ to a M________ it will A___________.
orce
ass
ccelerate
FORCE
ACCELERATE
MASS

22. FORMULA: Force = Mass X Acceleration
Newton’s 2nd Law says…
FORMULA: Force = Mass X Acceleration
F = m X a F X m a

23. CAN YOU DERIVE THE UNIT FOR FORCE ?
Force = Mass X Acceleration
= kg X m/s2
kg X m/s2
kg*m/s2 = NEWTON
FORCE is measured in NEWTONS ! m a F X

24. Calculate the force needed to push a truck that has a mass of 2,000 kg with an acceleration of 0.05 m/s2.
100 N m a F X
100 N
2,000 kg
0.05 m/s2

25. Calculate the force needed to push a car that has a mass of 1,000 kg with an acceleration of 0.05 m/s2.
50 N m a F X
50 N
1,000 kg
0.05 m/s2

26. Calculate the acceleration of a 1,000 kg elephant if a force of 100 N is applied.
0.1 m/s2
100 N
__?__ m/s2 m a F X
100 N
1,000 kg
0.1 m/s2

27. Newton’s Third Law
Action Reaction

28. What do you predict will happen when the air is released from the balloon? Why?
string

29. Let’s Observe….
air goes this way!
string

30. Newton’s 3rd Law of Motion
string
ACTION - Air released
REACTION - Balloon moved

31. Let's observe some
different scenerios!

33. Newton’s 3rd Law of Motion states:
When one object exerts a f____ on a second object, the second object exerts a f____ on the first that is e____ in size and o______ in direction.
orce
orce
qual
pposite

34. Newton’s 3rd Law…Sum it up…
ction
For every A_____ there is an equal and opposite R______!
eaction

35. Remember…forces come in pairs.
QUESTION???
Is it possible for you to touch without being touched? Think about it….
Remember…forces come in pairs.

36. Let's practice identifying
action-reaction forces

37. Billy-Bob shoots a hunting gun. Can you identify the action
Billy-Bob shoots a hunting gun. Can you identify the action? Can you identify the reaction?
ACTION: Bullet exiting gun
REACTION: Gun pushing Billy-Bob back

38. Sarah is on ice skates and she pushes against a wall
Sarah is on ice skates and she pushes against a wall. Can you identify the action? Can you identify the reaction?
REACTION: Wall pushing back
ACTION: Pushing on wall

39. Can you identify the action? Can you identify the reaction?
Here is a water rocket.
Can you identify the action?
Can you identify the reaction?
REACTION: water rocket shooting upward
ACTION: Pressurized water exiting the rocket

40. Jimmy lifts his weights. Can you identify the action?
Can you identify the reaction?
ACTION: Pushing up on weights
REACTION: Weights pushing down

41. Can you identify the action? Can you identify the reaction?
Charlie hit a baseball.
Can you identify the action?
Can you identify the reaction?
REACTION: Ball hitting bat and the ball accelerating
ACTION: Bat hitting ball

42. different action-reaction pairs?
Can you think of some
different action-reaction pairs?