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(Answered) PHYSICS Coulomb Force Gizmo / Student Exploration: Coulomb Force (Static)Complete latest fall 2021
(Answered) PHYSICS Coulomb Force Gizmo / Student Exploration: Coulomb Force (Static) Complete latest fall 2021
(Answered) PHYSICS Coulomb Force Gizmo / Student Exploration: Coulomb Force (Static) Complete latest fall 2021
Conceptual Activity
Coulomb Force (Static)
Vocabulary: Coulomb’s law, electrostatic force, vector
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
Have you ever taken clothes out of the dryer and found a sock stuck to your underwear? Static cling is an example of electrostatic forces , or the forces that exist between charged objects.
- How do you think the sock and underwear became charged?
While the clothes were drying, electrons were removed from some items of clothing and deposited on others.
- Suppose two socks acquire the same charge. Do you think they will stick together?
No I don’t think they will stick together.
Explain: I think this because like charges repel each other.
Gizmo Warm-up
As clothes are tumbled in a dryer, electrons are rubbed off some items, giving them a positive charge, and deposited on other items, giving them a negative charge. These charged items exert electrostatic forces on one another. You can explore these forces by using the Coulomb Force (Static) Gizmo™.
In its initial settings, the Gizmo shows two objects that each have a charge ( q ) of 10.0! 10-4^ C (coulombs). Turn on the Show force vector checkboxes for objects A and B. The arrows coming from the objects are vectors that represent the electrostatic forces. The direction and length of each vector show the direction and magnitude (strength) of each force.
- Are the vectors for objects A and B pointing together or away from each other? Away
(Answered) PHYSICS Coulomb Force Gizmo / Student Exploration: Coulomb Force (Static)Complete latest fall 2021
(Answered) PHYSICS Coulomb Force Gizmo / Student Exploration: Coulomb Force (Static) Complete latest fall 2021
(Answered) PHYSICS Coulomb Force Gizmo / Student Exploration: Coulomb Force (Static) Complete latest fall 2021
- Are objects A and B attracted together or repelled apart? Repelled apart
Complete latest fall 2021
Get the Gizmo ready: Turn on Show distance. Set qA to 10.0! 10 -^4 C and qB to 1.0! 10 -^4 C.
Activity B: The effect of distance
5. Gather data: For each charge combination listed in the table below, write magnitude of the force on object A. (Note: The magnitude of the force, or its strength, is always positive.) qA qB | FA | Factor qA****! qB 1.0! 10 -^4 C 1.0! 10 -^4 C 0.90 N 1 1.0! 10 -^8 C 1.0! 10 -^4 C 2.0! 10 -^4 C 1.80 N 2 2.0! 10 -^8 C 2.0! 10 -^4 C 2.0! 10 -^4 C 3.60 N 4 4.0! 10 -^8 C 2.0! 10 -^4 C 3.0! 10 -^4 C 5.40 N 6 6.0! 10 -^8 C 6. Analyze: What patterns do you notice in the data?
I noticed that when one charge is doubled, the force doubles. When both charges are doubled, the force is multiplied by four.
7. Calculate: To calculate how much the force is multiplied, divide each force by the first value, 0.90 N. Fill in these values under Factor in the table.
What do you notice? The factor doubles when one of the forces is doubled.
8. Calculate: Calculate the product of the two charges, and fill in these values in the last column. Compare these numbers to the Factor numbers.
What do you notice? The product qA xqB is proportional to the force factor.
9. Apply: What would you expect the force to be if the charge of object A was 5.0! 10-4^ C and the
charge of object B was 4.0! 10-4^ C? 18.00 N
Use the Gizmo to check your answer.
Question: How does distance affect the strength of the electrostatic force?
- Observe: Move object A back and forth. How does the distance between the objects affect the strength of the electrostatic force between them?
The magnitude of the electrostatic force decreases as the objects move apart.
Complete latest fall 2021
- Predict: How do you think the electrostatic force between two objects will change if the
distance between the two objects is doubled? I predict it will decrease.
- Measure: Place object A on the x- axis at -2, and object B on the x- axis at +1.
A. What is the magnitude of the force on object A? | FA | = 100.0 N
B. What is the magnitude of the force on object B? | FB | = 100.0 N
4. Gather data: Check that qA is 10.0! 10-4^ C and qB is 1.0! 10-4^ C. For each position of object A, record the distance between the objects and the force on object A.
Object A Object B Distance (m) | FA |^ (N)^
Distance factor
Force factor
Dist. factor^2 (-2, 0) (1, 0) 3 m 100.0 N 1 1.00 1. (-5, 0) (1, 0) 6 m 25.00 N 2 0.250 0. (-11, 0) (1, 0) 12 m 6.25 N 4 0.0625 0. (-14, 0) (1,0) 15 m 4.00 N 5 0.04 0.
- Calculate: To calculate the distance factor, divide each distance by the original distance (3 m). To calculate the force factor, divide each force by the original force (100 N). A. How does the force change as the distance increases?
The force decreases as the distance increases.
B. Now find the reciprocal of each distance factor squared. What do you notice?
The force factor is equal to the reciprocal of the distance factor squared.
- Apply: What would you expect the force to be if the distance was 30 meters? 1.00 N
How did you come up with your answer?
The distance factor is 10 (30 m ÷ 3 m). The reciprocal of the distance factor is 0.1. The square of this value is 0.01. Therefore, the force factor is 0.01 and the resulting force is 0.01 or 1. N.
Use the Gizmo to check your answer.
