Gravity and Kepler's Laws

​Gravity is the force that pulls objects together.

Everything that has mass has gravity.

The more mass an object has the stronger the force of Gravity.

The closer you are to an object the more powerful the force.

​Gravity

Multiple Select

What factors effect gravity? (2 answers)

• Size

• Mass

• Distance

• Element

• Shape

​A gravity well is a hypothetical representation of how distance affects gravity

Dropdown

The more ​

Select answer

an object the "deeper" its gravity well.

Open Ended

Why do objects fall at different rates here on earth?

Drag and Drop

​

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means "earth centered"

The theory that the Earth is at the center of universe was first mentioned by ​

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and ​

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.

This is seemed to make sense because the ​

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and stars seem to go ​

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the Earth.

Drag these tiles and drop them in the correct blank above

Geocentric

Ptolemy

Aristotole

Sun

around

Heliocentric

Pliny

above

Planes

Multiple Choice

The Geocentric Theory claims that the celestial bodies move around the earth in:

• Spheres

• Ellipses

• Firmanents

• Ice walls

Multiple Choice

Who was the philospher that caim up with the heliocentric theory?

• Aristotle

• Pliny

• Ptolemy

• Copernicus

• Galileo

Multiple Choice

Did Copernicuses heliocentric theory answer all of the questions about stars in the sky?

• True

• False

Multiple Choice

Who came up with the Geo-Heliocenteric Theory?

• Tycho Brahe

• Johannes Kepler

• Aritsotle Pliny

• Corpinicous

Open Ended

What make the Geo-Heliocentric theory different from the Geocenteric and Heliocentric theories?

Multiple Choice

Who was Kepler the assistant of?

• Tycho Brahe

• Galileo Galailee

• Isaac Newton

• Sally Macintosh

Draw

Draw an ellispse and label the two foci

Drag and Drop

Kepler's ​

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Law states that every ​

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moves around the Sun in an ​

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. The Sun is at one of the ​

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.

Drag these tiles and drop them in the correct blank above

First

planet

ellispe

foci

Center

Second

Cirlce

Middle

Open Ended

Why does the earth "sweep out" in equal areas around the Sun?

Labelling

Match the labels to the planetary ellispe

Drag labels to their correct position on the image

Foci

Perihelion

Semi Major Axis

Sun (Foci)

Semi Minor Eaxis

Planet

Aphelion

Multiple Choice

If you know the distance of a planet you can figure out the ________

• Year

• Day

• Light waves

• Direction

Multiple Choice

What are the two factors that influence gravity the most?

• Mass and weight
• Weight and gravity
• Mass and distance
• Weight and distance

Multiple Choice

Name one way to increase the gravity between objects. 

• Increase distance
• Decrease distance
• Decrease volume
• Remove atoms

Multiple Choice

Where is the planet moving faster?

• around segment A

• around segment B

• around either segment - the speed doesn't change

• impossible to know

Multiple Choice

The picture shows the gravitational field in the space surrounding the Earth. What is creating this gravitational field?

• The gravitational force.

• The mass of the Earth.

• The distance of the Earth.

• The universal gravitational constant.

Multiple Choice

What is the definition of an ellipse?

• All points equidistant from a single point.

• All points that are equidistant to the sum of the distance between two points.

• All points equidistant to the difference of the distance between two points.

• All points equidistant to the sum of the distance between a fixed point and a line.

Multiple Choice

What is the physical reasoning behind Kepler's 2nd law (equal areas in equal times)?

• Gravity is weaker as the distance between objects increase, and is stronger as they move closer together.

• The sun is pulling the sattelite forwards in the orbit as it moves closer, and pulls backwards as it movevs away.

• Because calculus.

• The sattelite is pulling on the sun with an equal and opposite force.

Multiple Choice

Earth's orbit follows an elliptical path.

• Kepler's 1st law
• Kepler's 2nd law
• Kepler's 3rd law
• Nutation