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Pith Ball Lab (answered) Gizmoz; Student Exploration: Pith Ball Lab 2021

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Pith Ball Lab Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: Coulomb’s law, electrostatic force, gravitational force, induced charge, pith ball, Pythagorean Theorem, tension, vector Prior Knowledge Questions ...

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  • 11 maart 2022
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  • 2021/2022
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Door: gianlucapecora34 • 2 jaar geleden

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Student Exploration: Pith Ball Lab
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.

Vocabulary​:​ Coulomb’s law, electrostatic force, gravitational force, induced charge, pith ball, Pythagorean
Theorem, tension, vector

Prior Knowledge Questions ​(Do these BEFORE using the Gizmo.)

1. A girl rubs a balloon on her head and then holds it a short distance away.
Why does her hair stick to the balloon?


Because of static electricity


2. Why do you think the individual strands of hair are spread apart?


The strands probably all have the same charge so they repel one another


Gizmo Warm-up
The girl’s hair was attracted to the balloon by the ​electrostatic force​, a force
between all charged objects. Most objects acquire a charge (​q​) by gaining or
losing electrons. Objects that gain electrons become negatively charged, while
objects that lose electrons become positively charged.

The ​Pith Ball Lab ​Gizmo shows two ​pith balls​ hanging by strings. Pith balls are
made from lightweight material that can easily acquire a charge. To begin, check
that the charge on each pith ball (​q1​ ​ ​and ​q​2)​ is 0.0 × 10​-6​ coulombs (C).

Use the sliders to test each combination of charges listed below. State whether the electrostatic force is
attractive (balls move together), repulsive (balls move apart), or zero (balls don’t move).

Charge on left ball (​q1​ ​) Charge on right ball (​q2​ ​) Electrostatic force
Positive Zero zero
Zero Negative zero
Positive Positive repulsive
Negative Negative repulsive
Positive Negative attractive




Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved

, Get the Gizmo ready​:
Activity A:
​ ​2​ to 0.0 × 10​-6​ C.
● Set ​q1​ ​ and q
Coulomb’s law ● Set the ​mass​ ​of the pith balls to 5 grams.
● Check that ​g​ is 9.8 m/s​2​ and L ​ ​ is 0.50 m.


Question: What factors affect the force between charged objects?

1. Summarize​: Summarize what you have learned so far by filling in the blanks:

If the two charges are the same, the force is repulsive

If the two charges are opposite, the force is attractive

If one of the charges is zero, the force is zero


​ izmo does not show ​induced charge​. An induced charge occurs
*Note: For simplicity, the ​Pith Ball Lab G
when a charged object is brought near a neutral object, causing the electrons in the neutral object to move
away from or towards the charged object. This results in an attractive force between the charged object
and the neutral object.

2. Predict​: How do you think the strength of electrostatic force is related to the charges on the balls and the
distance between them?


As the charges get further apart, the distance decreases and the electrostatic force increases
(and vice versa).


3. Observe​: Set ​q​1​ to -5.0 × 10​-6​ C. Gradually decrease ​q​2​ below 0.0 × 10​-6​ C.


A. What do you observe? they slowly get further apart

B. What does this tell you about the force the repulsive force is increasing as the charges get
between the pith balls? closer


4. Observe​: Now slowly increase ​q2​ ​ above 0.0 × 10​-6​ C. What do you observe, and what does this tell you
about the electrostatic force?


The distance decreases as I increase q​2​ . This shows that since q​1​ is negative and q​2​ is
an increasing positive number, the electrostatic force increases as well. The
electrostatic force increases as the charges get further apart.




Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved

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