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Gravity Force Lab Basics
Remote Lab
(This lesson is designed for a student working remotely.)
This lab uses the
Gravity Force Lab Basics
simulation from PhET Interactive Simulations at
University of Colorado Boulder, under the CC-BY 4.0 license.
https://phet.colorado.edu/sims/html/gravity-force-lab-basics/latest/gravity-force-lab-basics_en.html
Learning Goal:
Students will investigate the variables that affect gravity.
QUESTION: How does gravity affect objects?
Jasmine and Emily were learning about forces in class. They learned that a force was either a push or a pull.
Emily wondered if gravity was a force. She knew that when she dropped her book it was pulled down to the
ground. Jasmine knew that the moon had less gravity than the earth, but she wasn’t sure why.
Underline the statements you think are true:
o
Gravity depends on the material of the objects.
o
Gravity is not a force because it can’t move objects.
o
Gravity is a force because a force is a push or a pull.
o
The moon has less gravity than the Earth because it has less mass than the Earth.
o
The moon has less gravity than the Earth because it has no atmosphere.
Background information:
Variable-
A variable is any factor that can be changed or controlled
Independent Variable
– something that is changed by the scientist
●
What is tested
●
What is manipulated
Dependent Variable
– something that might be affected by the change in the independent variable
●
What is observed
●
What is measured
●
The data collected during the investigation
4/26/20 Loeblein and Borenstein
https://phet.colorado.edu/en/contributions/view/4076
page 1
INSTRUCTIONS: Open up the
Gravity Force Lab Basics
simulation on the PhET website.
https://phet.colorado.edu/sims/html/gravity-force-lab-basics/latest/gravity-force-lab-basics_en.html
1.
Get familiar with the simulation by moving the figures back and forth as well as changing the mass of
the spheres.
2.
Underline the different variables that can be found in this simulation.
Distance between figures
Mass of the spheres
Force
Size of the figures
Strength of the figures
Size of spheres
3.
What do you think the size of the arrows on top of each sphere represent?
Think the arrows on top of each sphere represent the force. The longer the arrow is the greater the force
is and the shorter the arrow the less force.
4.
Pick a variable to manipulate (the independent variable). Summarize what you changed and what
happened in the table below:
Manipulated (Independent) Variable
Dependent Variable
I increased the distance between the two. fWhen I move the two objects' distance
increasing the force decreases
5.
Change a different variable and summarize what happens in the table below:
Manipulated (Independent) Variable
Dependent Variable
I changed the object (mass 2 ) from 4
billion kg to 10 billion kg.
When I increase the mass the
gravitational force increases.
Test your understanding:
True or False State the correct answer and provide your reasoning
6. Gravity is a force that can be changed.
T/F
Yes, due to the fundamental force in nature that governs the attraction between objects with mass.
7. The bigger an object is, the smaller the force of gravity. T/F
The force of gravity is directly proportional to the product of the masses of two objects.
8. As one object gets closer to another object, the force of gravity will increase. T/F
The force of gravity between two objects is inversely proportional because distance between their centers.
9. The Sun has a greater gravitational force than Jupiter. T/F
This is because the mass of the Sun is significantly greater than the mass of Jupiter
10. Which of the pairs has greater gravitational force?
4/26/20 Loeblein and Borenstein
https://phet.colorado.edu/en/contributions/view/4076
page 2
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