daily agenda for november 11th and 12th daily agenda for november 11 th and 12 th do now: from the...
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Daily Agenda for November 11th and 12th DO NOW: • From the front of the classroom, take a Do Now.• The Biebs and the Shotput are chilling on my
desk. • Draw/ describe the forces acting on these guys!
Homework due (place in inbox)• Newton’s 1st Law Video Analysis homework
Tonight’s Homework:• You’ll get these handouts later in class! Read and Study Chapter 4; answer #1-16 in Early Astronomer Guided Notes. Then, complete the questions on the HW handout:• Watch video assignment and complete if you
had difficulty over the weekend.
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What’s the BIG idea?Where did Newton’s Law come from?
How did people view motion in ancient times?
What is a force?
Can something be at rest and still have forces acting on it?
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Do Now
PART 1
Shot put and Justin Bieber:
Describe the forces acting on the Shotput and Justin Bieber NOW (Why do the two objects stay at rest? Use pictures or words)
Do Now
PART 2
Shot put and Justin Bieber:
Describe the forces on the shot put when I push it off the table (What happens to the shot put? What happened to Bieber? Why does it happen? Use pictures or words)
Do Now: Force Diagrams
What is holding them down?What is keeping the shot put from rolling off the
edge?In which directions are these forces acting?
**THINK ABOUT THE DEMOs FROM LAST LESSON!**
What FORCE caused the shot put to fall?Why did the shot put stop moving?
What force to be squished?In which directions are these forces acting?
**THINK ABOUT THE DEMOs FROM LAST LESSON!**
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Force DiagramsFORCES are VECTORS which
means…
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Force DiagramsMagnitude is represented by the
Length of the Arrow
Small Magnitude:
Large Magnitude:
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Force DiagramsDirection is represented by the
way the arrow is pointed!
Force due to Gravity:
Force due to Friction:FGravity
FFriction
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pull
magnitudedirection
push
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pull
magnitudedirection
push
∑F… the Greek letter SIGMA. ∑ means “SUM OF”
ALL FORCES acting on an object. (Think back to displacement diagrams
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Go BACK to your Do NowTry creating a force diagram for
both scenarios!
We will review on board
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Force Diagrams
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Force Diagrams
Fs
Fg
Fg
FS
FappliedFf
Fg
Ff Ff
Fg
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Force Diagrams
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Force Diagrams
FS
Fg FknifeOr
FappliedFg
FS
Fg
Ff Ff
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Mechanical Equilibrium ( ME)
Static Equilibrium ( SE) Dynamic Equilibrium ( DE)
VelocityAND Zero acceleration
accelerationvelocity
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MechanicalStatic
Dynamic
It’s in Mech. Eq!Think back to our Do Now!Weight/gravitySupport forceThey are FORCES but they CANCEL OUT. (SE)Or….something could be MOVING at a constant velocity. Weight and support cancel; push and friction cancel (DE)
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CHAPTER 4: Newton’s first law of Motion…inertia**DISCLAIMER** The information you are about to see does not represent the views, beliefs, or scientific facts held to be true by Mr. O’Connor, Mrs. Correia, Mrs. Warren and the scientific community. Please remember that the views expressed are those of really old, REALLY dead scientists who made amazing contributions but weren’t always correct.
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Read AristotleAnswer a through d
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WHO? Aristotle(Aριστοτέλης)
WHERE? GreeceWHEN? 4thCentury
B.C.WHAT? Natural
motion vs. violent motion; objects belong at rest unless experiencing a push or pull, or returning to rest
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Read CopernicusAnswer e
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WHO? Copernicus
WHERE? PolandWHEN? 1473-1543WHAT? Earth and other
planets move around the sun; his ideas were so controversial that people persecuted him (De Revolutionibus)
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Read Galileo and NewtonAnswer f
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WHO? Galileo GalileiWHERE? ItalyWHEN? Late Renaissance (1564-1642)WHAT? Need a force to KEEP an object moving ONLY if there is friction; objects resist change to states of motion (inertia); concerned with HOW not WHY things move
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Close-up view of Galileo’s Inclined Plane Bells
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Galileo’s Original Telescope
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Newton’s Cradle (1600’s)
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TONIGHT’S HOMEWORKRead and Study Chapter 4; answer
#1-16 in Early Astronomer Guided Notes.
Then, complete the questions on the HW handout:
Watch video assignment and complete if you had difficulty over the weekend.• Remember what the LENGTH and
DIRECTION of the arrows mean
EXIT SLIPS TURNED IN PLEASE!