gravity the headline on gravity

April 06, 2014

Two friends were talking about gravity.

Mrs. R said, "Gravity needs an atmosphere or air. If there's no air or atmosphere, there will be no gravity."

Ms. F said, "Gravity doesn't need an atmosphere or air. If there's no air or atmosphere, there will still be gravity."

Which one do you agree with? On the left side, describe your thinking & explain why you agree with one and disagree with the other.

gravitygravity

starter 4/8/14

The headline on GRAVITYBritney tells all aboutG R A V I T Y

girls fight gravity!Gravity deals final BLOW!

Inquiring mindsWANTTOKNOW!!

Let's take a look at weight....

Imagine that on Earth, Britney Spears weighs100 pounds.

2

S8P5a.: Students will recognize the characteristics of gravity...and that the force exerted depends on the mass of the object and the distance of the objects

Yes, this isBritney.

She used to be a Mouseketeer on the Mickey MouseClub on the Disney Channel. Happier times.

Let's remember Britney in happier times.

3


April 06, 2014

Britney Spears on Earth weighs 100 pounds.

But B decides to take a trip into....

4p


B.S. ship

p 5


In space, Britney is far, far away from Earth's gravity.

Weight is a measure of how much gravity pulls on us.

Too far for Earth'sgravity to affectBritney.

She now weighs0 pounds.

What about on the moon?

No gravity here.

6S8P5a.: Students will recognize the characteristics of gravity...and that the force exerted depends on the mass of the object and the distance of the objects

The smaller the object (with less mass), the less gravitational pull it has. 7

April 06, 2014

The moon has gravity, but not as much as Earth's because it's smaller.

Less gravity,meansanyone on the moonwould weigh 6 timesless than theydo on Earth.

8


Since the moon is smaller, it has less gravitationalpull (6 times less) which means that

A 100 pound Britneywould onlyweigh 16.6 poundson themoon.

9S8P5a.: Students will recognize the characteristics of gravity...and that the force exerted depends on the mass of the object and the distance of the objects

T.P.S.: Since she weighs less, will her outfits still fit?

This outfit is particularly adorable.

10S8CS3: Students will have the computation and estimationskills necessary for analyzing data and following scientific explanations

So if she weighs 100 pounds on Earth, 16.6 pounds on the Moon,and 0 pounds in space,will that make a difference in how her clothes fit when she leaves Earth?

EARTH MOON

SPACE

11S8CS3: Students will have the computation and estimationskills necessary for analyzing data and following scientific explanations

April 06, 2014

Because her body masshas not changed.She still has the same amountof muscle, bones, teeth, skin,fat.....and oh! Look! Hair......

Much to Britney'srelief...her clotheswill still fit.

12

Why?

So, Britney, bring it home for us Girlfriend...

Mass

is the amount of

matter in an object.

It doesn't change just

because you go to a

different place.

End of B. S.

lesson.

13

And now, let's look at what keeps an item orbiting around the earth...

April 06, 2014

So,inertia pushes the object

FORWARD while gravity pulls it DOWNWARD

and if theseforces are BALANCED then the

object remains in orbit.

S8P3a. Determine the relationship between velocity and acceleration.S8CS5b. Understand that different models can be used to represent the same thing.L6-8RST7: Integrate quantitative or technical information expressed in words in a text with a version of that information expressed visually (e.g., in a flowchart, diagram, model, graph or table).

Josey and her little brother are walking side by side, eating ice cream cones. Josey stops to talk to a friend. While she is talking, Jack's ice cream cone starts to drip at a steady rate as Jack walks away. When Josey finishes talking to her friend and realizes that Jack is no longer next to her, she looks down and notices these drips of ice cream on the ground from Jack's ice cream cone.

Josey needs help figuring out how Jack was walking while she was talking. If Josey follows the drips, what can they tell her about Jack's motion?

Lets look at Jack & his ice-cream drips...


Pick a side. A: go to front of room by Mrs. R's desk B: go to front by my desk, C: go to back by door, D: go to back door by courtyard.

A: Jack started walking really slowly and then went faster and faster.

B: Jack started walking really fast, slowed down and went slower and slower.

C: Jack started out walking slowly, then walked faster and continued at the same speed.

D: Jack started out fast,slowed down, and continued at the same, steady speed.

April 06, 2014

What might that drip pattern look like as a graph?

time, t

dist

ance

trav

eled

, d

Activity 75: Interpreting Motion Graphs

CHALLENGEQUESTION:

How can you use a graphto describe motion?


MOTION GRAPHS LOOK LIKE THIS:

DIS

TAN

CE

is h

ere

TIME goes here

S8P3a. Determine the relationship between velocity and acceleration.

x

y

DIS

TAN

CE

TIME

I am going away frommy starting point

y

x

In motion graphs, a positive slope means you're going away from your starting point


April 06, 2014

DIS

TAN

CE

TIME

I am going back tomy starting point

y

x

In motion graphs, a negative slope means you're going toward your starting point (you've turned around)


DIS

TAN

CE

TIME

I am sitting still, like at a red light

y

x

In motion graphs, a zero slope means you're not going anywhere (but time is still passing)

S8P3a. Determine the relationship between velocity and acceleration.

Here's an example: Ms. Fendler goes to work

DIS

TAN

CE

in m

iles

TIME in minutes

876543210

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Yay!

Drag the picture to the line that might represent what happened


watch and be amazed.

April 06, 2014

P O S TMs. F went faster, went slower, and

changed direction.

to speed up, slow down or

change directions.

accelerate


velocity: speed with direction.

So... 50 miles per hour is...50 miles per hour south is...

speedvelocity

Ah-ha!

What??!?

gravity the headline on gravity

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