# Universal gravitation phet simulation physics 2010

Universal Gravitation PhET Lab

Why everyone in this class is attracted everyone else.

Introduction:

Every object around you is attracted to you.  In fact, every object in the galaxy is attracted to every other object in the galaxy.  Newton postulated and Cavendish confirmed that all objects with mass are attracted to all other objects with mass by a force that is proportional to their masses and inversely proportional to the square of the distance between the objects’ centers.  This relationship became Newton’s Law of Universal Gravitation.  In this simulation, you will look at two massive objects and their gravitational force between them to observe G, the constant of universal gravity that Cavendish investigated.

Important Formulas:

Procedure: PhET Simulations à Play with the Sims à Physics à Gravity Force Lab

1.      Take some time and familiarize yourself with the simulation.  Notice how forces change as mass changes and as distance changes.

2.      Fill out the chart below for various objects at various distances.

3.      Solve for the universal gravitation constant, G and compare it to published values.

Remember significant digits!

Mass Object 1                   Mass Object 2                       Distance                                 Force                  Gravitation Constant,G

 56.30 kg 52.20 kg 3.0 m

Average value of G:    ___________________                      Units of G:      ___________________

Published value of G:  ___________________                     Source:            ___________________

How did your value of G compare to the published value you found? __________________________________

Conclusion Questions and Calculations:        ½-point each

1.      Gravitational force is always attractive / repulsive. (circle)

2.      Newton’s 3rd Law tells us that if a gravitational force exists between two objects, one very massive and one less massive, then the force on the less massive object will be greater than / equal to / less than the force on the more massive object.

3.      The distance between masses is measured from their edges between them / from their centers / from the edge of one to the center of the other.

4.      As the distance between masses decreases, force increases / decreases.

5.      Doubling the mass of both masses would result in a change of force between the masses of  8x / 6x / 4x / 2x / no change / ½x / ¼x / 1/6x / 1/8x.

6.      Reducing the distance between two masses to half while doubling the mass of one of the masses would result in a change of force between the masses of  8x / 6x / 4x / 2x / no change / ½x / ¼x / 1/6x / 1/8x.

7.      What is the gravitational force between two students, Dylan and Sarah, if Dylan has a mass of 75 kg, Sarah has a mass of 54 kg, and their centers are separated by a distance of .45 m?                 ________________ N

8.      What is the gravitational force between two students, John and Mike, if John has a mass of 81 kg, Mike has a mass of 93 kg, and their centers are separated by a distance of .62 m?              ________________ N

9.      Imagine a 4820 kg satellite in a geosynchronous orbit.  If an 85 kg piece of space junk floats by at a distance of 3.5 m, what force will the space junk feel?                                                     ________________ N

10.  With what acceleration will the space junk move toward the satellite?                  ______________ m/s2

11.  With what acceleration will the satellite move (if any)?                                         ______________ m/s2

12.  (harder) Using the above information and what you know about kinematics, how far will the satellite have moved when it encounters the space junk, assuming they meet, each moving with the accelerations you solved for in #10, 11? (don’t worry about them getting closer, just use #10,11)         ________________ m

The moon has a mass of 7.35×1022 kg and is a lot farther away than is shown in textbooks.  The mass of the earth is 5.97×1024 kg.  The moon’s mean orbit distance (center-to-center) is around the earth is 3.84×108 m.  With all this information determine:

13.  The gravitational force on the moon by the earth.                                                 ________________ N

14.  The gravitational force on the earth by the moon.                                                 ________________ N

15.  The centripetal acceleration of the moon around the earth, realizing that the gravitational force is also centripetal force.                                                                                                         ______________ m/s2

16.  The speed of travel of the moon around the earth, using the formula for the speed of a moving object in a circular path.                                                                                                          ______________ m/s

Calculate the price
Pages (550 words)
\$0.00
*Price with a welcome 15% discount applied.
Pro tip: If you want to save more money and pay the lowest price, you need to set a more extended deadline.
We know how difficult it is to be a student these days. That's why our prices are one of the most affordable on the market, and there are no hidden fees.

Instead, we offer bonuses, discounts, and free services to make your experience outstanding.
How it works
Receive a 100% original paper that will pass Turnitin from a top essay writing service
step 1
Fill out the order form and provide paper details. You can even attach screenshots or add additional instructions later. If something is not clear or missing, the writer will contact you for clarification.
Pro service tips
How to get the most out of your experience with Australia Assessments
One writer throughout the entire course
If you like the writer, you can hire them again. Just copy & paste their ID on the order form ("Preferred Writer's ID" field). This way, your vocabulary will be uniform, and the writer will be aware of your needs.
The same paper from different writers
You can order essay or any other work from two different writers to choose the best one or give another version to a friend. This can be done through the add-on "Same paper from another writer."
Copy of sources used by the writer
Our college essay writers work with ScienceDirect and other databases. They can send you articles or materials used in PDF or through screenshots. Just tick the "Copy of sources" field on the order form.
Testimonials
See why 20k+ students have chosen us as their sole writing assistance provider
Check out the latest reviews and opinions submitted by real customers worldwide and make an informed decision.
Other
Excellent work.
Customer 462823, April 21st, 2022
MGMT 221 Introduction to Management Information System
Great job!
Customer 457731, February 25th, 2022
I received a mastery on this assignment!
Customer 463143, August 31st, 2022
Retail
Excellent work! This submission was informative and well-structured. We look forward to your future contributions.
Customer 452441, August 16th, 2022
Law
Good work.
Customer 462759, June 15th, 2022
Nursing
2 hrs late
Customer 454007, April 12th, 2020
Religious studies
This was well done thank you
Customer 452763, December 10th, 2021
Healthcare & Medical
Good work!
Customer 463469, October 17th, 2022
Nursing
Awesome! Thanks
Customer 454007, June 19th, 2020
Economics
I would like to thank you for your hard work. The essay is clear and clean.
Customer 462687, March 14th, 2022
Finance/Acc related
Great job!
Customer 460073, August 14th, 2022
Human Resources Management (HRM)
Good economics.
Customer 462499, May 1st, 2022
11,595
Customer reviews in total
96%
Current satisfaction rate
3 pages
Average paper length
37%
Customers referred by a friend