(Answered) PHYSICS Coulomb Force Gizmo Student Exploration Coulomb Force (Static) Complete latest fall 2021.

StudentExploration:CoulombForce (Static) 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, 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 electrostaticforces, or the forces that exist between charged objects. 1. How do you think the sock and underwear became charged? While they were in the dryer the electrons from other items transferred to other items 2. Suppose two socks acquire the same charge. Do you think they would stick together? Explain: They won’t stick together because they both would have the same charge 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 with 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 each object are vectors that represent the electrostatic force. The direction and length of each vector show the direction and magnitude (strength) of each force. 1. Are the vectors for objects A and B pointing together or away from each other? Away from eachother 2. Are objects A and B attracted together or repelled apart? they are repelled apart 3. Compare the lengths of the vectors. What do you notice? The length of both vectors are equal This stu Rd e y p s r o o u d r u ce ctw io a n s f d o o rw e n d lo u a c d a e t d io b n y al 1 u 0 s 0 e 00 o 0 n 8 l 1 y 8 . 8 P 3 u 3 b 9 l 9 ic 1 s fr h o am rinC g ou o r r se pH os er ti o n . g co pm ro o h n ib 0 i 3 te -1 d 7 . - ©20 2 2 0 3 2 0 0 7: E04 x : p 4 l 4 orG eMLe T ar - n 0 i 5 n : g 00™ All rights reserved Activity A: The effect of charge Get the Gizmoready: ● Turn on Show grid. Place object A on the x-axis at -5 and object B on the x-axis at +5. ● Check that Show force vector is turned on for each object. Question: How does charge affect the strength of the electrostatic force? 1. Observe: You can change the charge of each object by entering the desired value in the qA and qB boxes. Observe the force vectors for each of the situations listed in the table below. Based on the force vectors, state whether the objects are repelled from one another, attracted to one another, or if there is no force at all. qA qB Attraction, repulsion, or no force? 1.0 × 10-4 C 1.0 × 10-4 C repulsion -1.0 × 10-4 C 1.0 × 10-4 C attraction -1.0 × 10-4 C -1.0 × 10 -4 C repulsion 1.0 × 10-4 C 0.0 × 10-4 C no force 2. Make arule: Complete the following sentences with the words “attract,” “repel,” or “zero.” When the charges are the same, the two objects repel one another. When the charges are opposite, the two objects attract one another. When one of the objects has no charge, the resulting force is zero. 3. Predict: How do you think the magnitude of the electrostatic force between two objects will change if the charge of each object was doubled? THe electrostatic force will increase by half 4. Measure: Turn on Show vector notation for both objects. Set the charge of objects A and B to 1.0 × 10 -4 C. The force on object A is now -0.90i + 0j N. That means that the force is -0.90 N in the x direction and 0 N in the y direction. A. What is the magnitude of the force on object A? |FA| = 0.9N B. What is the magnitude of the force on object B? |FB| = 0.9N C. The force on object A is negative. What does this indicate about the direction of the force? The negative force indicates the force on A points to the left 5. Gatherdata: For each charge combination listed in the table below, write magnitude of the force on This study sourc Re ew p a r s o d d o uw ct n io lo n ad fo e r d e b d y u 1 c 0 a 0 t 0 io 0 n 0 a 8 l 1 u 88 s 3 e 3 o 9 n 9 l 1 y. fr P o um bC lic ou s r h s a eH rin e g ro o .c r o pm o o s n tin 0 g 3- p 1 r 7 o - h 2 i 0 b 2 it 3 e 0 d 7 . : ©04 2 :4 0 4 2G 0 MExT p - l 0 o 5 re :0 L0 earning™ All rights reserved 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 0.90N 1 1*10^-8 1.0 × 10-4 C 2.0 × 10-4 C 1.80N 2 2*10^-8 2.0 × 10-4 C 2.0 × 10-4 C 3.60N 4 4*10^-8 2.0 × 10-4 C 3.0 × 10-4 C 5.40N 6 6*10^-8 6. Analyze: What patterns do you notice in the data? The force doubles when one charge is doubled. When both of the 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? when one of the forces is doubled the factor doubles 8. Calculate: Calculate the product of the two charges, and fill in these values in the last column. Compare these numbersto the Factor numbers. What do you notice? The two objects multiplied together are 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? Check your answer with the Gizmo. 18 N 10. Challenge: Based on what you have learned, write an equation for the strength of the electrostatic force for two charges that are separated by 10 meters. Use the Gizmo to check your equation. F = F= (0.9 x 108 )-qA - qB ™ All rights reserved Activity B: The effect of distance Get the Gizmoready: ● Turn on Show distance. ● Set qA to 10.0 × 10 -4 C and qB to 1.0 × 10-4 C. Question: How does distance affect the strength of the electrostatic force? 1. 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 and the object move apart. 2. Predict: How do you think the electrostatic force between two objects would change if the distance between the two objects was doubled? Predictions will vary 3. 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 N B. What is the magnitude of the force on object A? |FA| = 100 N C. What is the magnitude of the force on object B? |FB| = 100 N