Daily Agenda for November 13th and 14th

DO NOW: • With your partner, review Net Force

Homework. Discuss your answers and how you arrived at your solutions.

Homework due (Place in the Inbox please!)• Video Analysis (assignment from last

week)Tonight’s Homework:• Read and Study Chapter 4• Complete, check, & correct #1-7 on your

POGIL (you’ll get this later in class today)

Mechanical Equilibrium ( ME) Is when…

The object is not changing its state of motion… so the object is not accelerating… and the net force on an object is zero.

And there are 2 types of it…Static Equilibrium

If it is at rest. What does this mean?

o Zero velocityo Zero acceleration

Dynamic EquilibriumIf it is moving in a STRAIGHT LINE at a CONSTANT SPEED. What does this mean?

o Constant velocity o Zero acceleration

REMEMBER

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)

What is “N”?◦A “Newton”◦Named after Sir Isaac Newton

◦It is a UNIT of force that we will learn more about NEXT class…

By applying a non-zero net force

12 N to the right

4 N to the right

0 N

What can you conclude MUST BE TRUE about Box 3? It’s in….

1. S.E.2. D.E.3. M.E, but not enough info to

say if it’s S.E. or D.E.4. None of the above - not in

equilibrium at all!5. Not sure

Mechanical Equilibrium ( ME) Is when…

The object is not changing its state of motion… so the object is not accelerating… and the net force on an object is zero.

And there are 2 types of it…Static Equilibrium

If it is at rest. What does this mean?

o Zero velocityo Zero acceleration

Dynamic EquilibriumIf it is moving in a STRAIGHT LINE at a CONSTANT SPEED. What does this mean?

o Constant velocity o Zero acceleration

Net Force

The net force depends on the magnitudes and directions of the applied forces.

2.1 Force

Net Force

The net force depends on the magnitudes and directions of the applied forces.

1 person pushing with 5N + 1 person pushing with 10 N is equal to 1 person pushing with 15 N

2.1 Force

Net Force

2.1 Force

The net force depends on the magnitudes and directions of the applied forces.

1 person pushing with 5N + 1 person pulling with 10 N is equal to 1 person pulling with 10 N

Net Force

The net force depends on the magnitudes and directions of the applied forces.

2.1 Force

Net Force

The net force depends on the magnitudes and directions of the applied forces.

2.1 Force

Net Force

The net force depends on the magnitudes and directions of the applied forces.

2.1 Force

What can you conclude MUST BE TRUE about this box? It’s in….

1. S.E.2. D.E.3. M.E, but not enough info to

say if it’s S.E. or D.E.4. None of the above - not in

equilibrium at all!5. Not sure

What can you conclude MUST BE TRUE about this box? It’s in….

1. S.E.2. D.E.3. M.E, but not enough info to

say if it’s S.E. or D.E.4. None of the above - not in

equilibrium at all!5. Not sure

Mechanical Equilibrium ( ME) Is when…

The object is not changing its state of motion… so the object is not accelerating… and the net force on an object is zero.

And there are 2 types of it…Static Equilibrium

If it is at rest. What does this mean?

o Zero velocityo Zero acceleration

Dynamic EquilibriumIf it is moving in a STRAIGHT LINE at a CONSTANT SPEED. What does this mean?

o Constant velocity o Zero acceleration

Take out Exit Slip Newton’s First Law!

• For the next 3-5 minutes, discuss your responses with your partner/surrounding group. Make corrections!

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 your teachers 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.

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

Questions…a through dAny questions about the HW (#1-8)?

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)

Questions…eAny questions about the HW (#9-13)?

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

Close-up view of Galileo’s Inclined Plane Bells

Galileo’s Original Telescope

Questions…Any questions about the HW (#14-16)?

WHO? Sir Isaac Newton WHERE? EnglandWHEN? December 25, 1642 - March 20, 1727WHAT?

3 LAWS OF MOTION!AND Law of Universal Gravitation

Newton’s Cradle (1600’s)

Questions…fAny questions about Newton?http://www.youtube.com/watch?v

=VupFDDrX0Rw#t=226

TASKS:CHECK and CORRECT your

tests!You WILL see these questions

again.If you don’t understand WHY an

answer is what it is…ASK!Answers mean NOTHING if you

don’t know how to get to them!

TASKS:HW - #1-7 on POGIL

(check/correct online)

EXIT SLIPS: In IN BOX

TESTS: Give to Mrs. Correia on way out the door

Early Astronomers: Give to Mr. O’Connor on the way out the door

Is this a mass, weight, or volume?

2000 lb race car

2kg Discus

500mL BeakerMASS

VOLUME

Weight

Mass Weight Volume T Chart

2000 lb race car

In each column, provide an example of Weight, Mass, and Volume

2kg Discus 500ml Beaker

USE CORRECT UNITS!Remember Metric

Patrol!

What is the difference between Mass, Weight, and Volume?

If I stood on a regular bathroom scale in outer space, what would it read?

Does location affect my weight?

What’s the BIG idea?

POGIL- Moving ObjectsWork in groups of 4-5You may work at a lab bench, but

make sure you are able to see the projector

Work efficiently on these problems! Whatever is not finished becomes homework!

At each check in with a teacher. DO NOT GO AHEAD UNTIL YOU HAVE DONE SO.

^(on Earth)What do we know?? (Look at Page 3)

2.5kg1kg9.8N 24.5N

What is the difference between Mass, Weight, and Volume?

Mass: Quantity of how much matter is in an object. Units: g, kg, mg, etc.

Weight: Measurement of force of gravity acting on an object. Units: pounds (lbs) Newtons (N)

Volume: How much space an object takes up. Units: cubic cm, Liters (L), cubic meters

What’s the BIG idea?

If I stood on a regular bathroom scale in outer space (aka weightless environment), what would the scale read?

What’s the BIG idea?

ZERO!

Weightlessness= Zero Gravity

Does location affect my weight?

What’s the BIG idea?

YES!!

Example?

EXIT SLIP

On a loose-leaf/scrap piece of paper, answer the following questions and place it in the inbox on your way out1)

2)

3)

TONIGHT’S HOMEWORKFrom the front of the classroom,

please pick up Weight v. Mass Homework.

There are dimensional analysis problems, you can do them! Look at the conversion sheet given on the first page.PLACE EXIT SLIP IN THE INBOX