1. Nov.29, 2017 You need: Clean paper / pencil
**Any work you need to turn in?**
**Warm Ups from Nov (one page)**
Warm Up:
What did you do to contribute to your education?
What did you to do HURT your education? (while I was away)
I CAN: define WORK and determine how a simple machine helps.
Nov.29, 2017

4. REVIEW These notes were taken on Tuesday before Thanksgiving.
You should have them written on your foldable.
If you did not write them (or have lost them) remember to do it – but on your time!!

5. THE LAW OF
Newton’s 1st Law
INERTIA

6. Newton’s 1st Law of Motion
Newton’s 1st law of motion states:
An object at rest will remain at rest,
-and-
an object moving at a constant velocity will continue moving at a constant velocity,
-UNLESS-
it is acted upon by an unbalanced force.

7. Newton’s 1st Law of Motion
Explain this animation:
The truck is stopped by the force of the impact with the car, but the ladder continues to move at its original speed and in its original direction because of inertia.

8. STOP - REVIEW
AGAIN…These notes were taken on Tuesday before Thanksgiving.
You should have them written on your foldable.
If you did not write them (or have lost them) remember to do it – but on your time!!

9. Newton’s Laws of Motion Foldable
Newton’s First Law of Motion
Newton’s Second Law of Motion
Newton’s Third Law of Motion

10. THE LAW OF
Newton’s 2nd Law
Acceleration

11. So, how do unbalanced forces affect an object’s motion?
The harder you hit, the faster it goes!
The greater the force, the greater the acceleration…
Homerun Hit
Sacrifice Bunt

12. So, how does mass affect an object’s motion?
The fuller the cart, the slower it goes!
The more mass, the less acceleration…
Empty Cart
Full Cart

13. Newton’s 2nd Law of Motion
It states:
ACCELERATION depends on the object’s MASS, and the net FORCE acting on the object.
We can also write it mathematically:
Force = Mass x Acceleration

14. Careful!
Since this is review, I have example problems in the PowerPoint – but I have SLIGHTLY changed the numbers on the worksheet problems.
Just be aware and calculate using your brain – not the teacher (and NOT a calculator!)

15. Newton’s 2nd Law of Motion
Force = Mass x Acceleration
Mr. Sawyer’s car ran out of gas. How much force does Mr. Sawyer need to push his 750kg car at an acceleration of 1 m/s2?
F = m x a
F = 750 kg x 1 m/s2
F = 750 N right
750 kg
1 m/s2

16. Try one on your own…
Mrs. Miller’s van runs out of gas. How much force does she need to push the 2000kg van at an acceleration of 0.5 m/s2?
0.5 m/s2
F = m x a
F = 2000 kg x 0.5 m/s2
F = 1000 N right

17. Newton’s 2nd Law of Motion
Speed, Distance & Time
We can also write the formula like this:
Acceleration = Force
Mass
Mass = Force
Acceleration
Force = Mass x Acceleration m F a

18. Newton’s 2nd Law of Motion
Find the golf ball’s acceleration.
The putter hits the 0.05 kg golfball with a force of 1 N.
The driver hits the 0.05 kg golfball with a force of 8 N.

19. Newton’s 2nd Law of Motion
Use Newton’s 2nd law of motion to explain in words the difference in the motion of the golf balls. (Write it in your foldable!)

20. STOP!! – and calculate!
After reviewing the first and second laws, take some time to practice calculating.
Each student will need the worksheet…
Remember:
1. Show formula
2. Substitute the numbers
3. Give the final answer with unit.

21. STOP - REVIEW These notes were taken on Monday, Nov. 27th.
You should have them written on your foldable.
If you did not write them (or have lost them) remember to do it – but on your time!!

22. Newton’s Laws of Motion Foldable 1) Label your foldable like the one shown on the right. 2) Cut along the 2 dotted lines to make flaps.(You don’t have to cut) 3) On the inside, write down what the law states. 4) Write down an example of a situation that shows the law in action.
NEWTON’S
LAWS
Newton’s First Law of Motion
Newton’s Second Law of Motion
Newton’s Third Law of Motion

23. THE LAW OF
Newton’s 3rd Law
Interaction

24. Which forces are acting to get this guy up in the air?
His feet push DOWN on the ground.
But wait… His downward push can’t be causing his upward motion.

25. Which forces are acting to get this guy up in the air?
His feet push DOWN on the ground.
The ground pushes UP on the man.
There must be a force pushing UP!
The force of the ground pushes him UP!

26. Newton’s 3rd Law of Motion
Newton’s 3rd law says that: For every action force, there is an equal and opposite reaction force.
ALL forces act in PAIRS!
Action Force: Man’s feet push DOWN on the ground.
Reaction Force: Ground pushes UP on the man.

27. Newton’s 3rd Law of Motion
Explain this animation using Newton’s third law.

28. Newton’s 3rd Law of Motion
The man’s foot exerts a backward push on the boat (action force), while the boat exerts a forward push on the man (reaction force).
A PAIR OF FORCES:
EQUAL FORCES, BUT IN OPPOSITE DIRECTIONS

29. Identify the force pairs in each situation
A person fires a rifle. (Do not try this at home!)
Action Force – gun pushes the bullet out at high speed.
Reaction Force – the bullet pushes back on the gun (recoil).

30. Identify the force pairs in each situation
A space shuttle lifts off.
Action Force – engine pushes gases down & out.
Reaction Force – the gases push the rocket up.
*This upward force must be stronger than gravity pulling down on the rocket!

31. Identify the force pairs in each situation
A person stands still.
Action Force – gravity pulls the person down to the floor.
Reaction Force – the floor pushes up on the person.
*You don’t need MOTION for force pairs. They are everywhere!

32. If forces are equal and in opposite directions, why don’t they cancel out (and balance)?
Forces only cancel if they act on the same object. (Think about a tug of war – all forces act on the rope).
These forces are acting on different objects!
These forces are acting on different objects!
Action Force – Rocket engine pushing on gases.
Reaction Force – Gases push on the rocket.

33. What is Momentum? Momentum is a measure of how much motion object has.
It is affected by mass and velocity. The heavier an object is, the more momentum it has.
It’s easier to stop soccer ball coming towards you at 20 m/s than a car coming at 20 m/s.
It’s easier to stop car travelling at 1 km/h than a car travelling 60 km/h!

34. Conservation of Momentum
When objects collide, their total momentum is conserved (stays the same), unless outside forces act.
The total amount of motion coming into a collision will also come out of the collision.

35. Momentum = mass x velocity
Momentum can be calculated using this formula:
Momentum = mass x velocity
A golf ball with a mass of 0.05 kg travels at 16 m/s.
A baseball with a mass of 0.15 kg travels at 7 m/s.
Which ball has the greater momentum?
Golf ball’s momentum = 0.05 kg x 16 m/s
Baseball’s momentum = 0.15 kg x 7 m/s
= 0.8 kg m/s
= 1.05 kg m/s

36. Monday, Nov.27th Textbook Read through page 66 in the textbook.
You are looking to explain this picture.
Monday, Nov.27th
After reading, sketch the picture and label the forces that you see.
Explain (in sentence form), the circular motion.

37. Monday, Nov.27th Textbook – page 82-83
After taking notes (and reviewing circular motion), I want you to try the test practice.
On your own paper, write out the question and your answer choice.
Monday, Nov.27th
For example, you would write on your notebook paper –
A baseball has an approximate mass of 0.15 kg. If a bat strikes the baseball with a force of 6N, what is the acceleration of the ball?
C. 40 m/s2

38. Chapter 4 – Work and Simple Machines
Next up is…
Chapter 4 – Work and Simple Machines
This chapter starts on page 114 in the textbook.
LESSON 1 = Work and Power
Please read and answer the worksheet questions.
Each student should have four pages (front and back of one paper) – to answer as guided notes.
You should have worksheet pages 127, 132, 133, COMPLETELY fill these in based on your textbook.
Did you get this far?

39. Did you get this far? Then move on to… Chapter 4, Lesson 2 (page 124)
LESSON 2 = Using Machines
Please read and answer the worksheet questions.
Each student should have four pages (front and back of one paper) – to answer as guided notes.
You should have worksheet pages 135, 140, 141, COMPLETELY fill these in based on your textbook.
Did you get this far?