Here is the link to the Phet hockey game. The questions are based off the simula
ID: 1475096 • Letter: H
Question
Here is the link to the Phet hockey game. The questions are based off the simulation. Questions 7–15 refer to the “Electric Field Hockey” simulation. Refer to the figure shown in step #6 on the Lesson 3 webpage to check your settings for this simulation. 7. (2 points) Take a positive red ball from the box and place it directly south of the puck. An arrow will show up on the puck, indicating the size and direction of the electrostatic force the red charge applies to the black charge. As the red charge is brought closer and closer to the black charge, the force on the black charge: A. decreases B. increases C. stays the same 8. (2 points) The direction of the force on the black positive charge is: A. south B. north C. east D. west 9. (2 points) The direction of the force on the red positive charge will be: A. south B. north C. east D. west 10. (2 points) Now click on the “start” button. What happens? A. nothing B. The black charge moves away from the red charge, at a constant speed. C. The black charge moves away from the red charge, at a constant acceleration. D. The black charge moves away from the red charge, with a linearly changing acceleration. 11. (2 points) Place the red charge back in the box. Take a blue negative charge and place it directly north of the black positive charge. Take another blue charge and place it directly east of the black positive charge at approximately the same distance as the other blue charge. The direction of the electric force exerted by each blue charge on the black charge is indicated by an arrow. What is the direction of the resultant force acting on the black charge? A. east B. north C. northeast D. southwest E. The resultant is zero. 12. (2 points) Now click on the “start” button. Which direction did the black charge go? A. east B. north C. north-east D. south-west E. nowhere; it did not move 13. (2 points) Click the “reset” button. Take a blue negative charge and place it directly north of the black positive charge. Take a red positive charge and place it directly east of the black positive charge at approximately the same distance as the blue charge. The direction of the electric force exerted by the blue and red charge on the black charge is indicated by an arrow. What is the direction of the resultant force acting on the black charge? A. east B. north C. northeast D. northwest E. The resultant is zero. 14. (2 points) Now click on the “start” button. Which direction did the black charge go? A. east B. north C. northeast D. northwest E. The resultant is zero 15. (2 points) Click the “clear” button. Place two blue negative charges as shown below left (approximately at the tips of an equilateral triangle). Start the simulation and observe the motion of the black charge until it gets between the two blue charges. Click “reset” and move the two blue charges closer together, as shown in the figure below. Start the simulation and observe the motion of the black charge until it gets between the two blue charges. What happens when the two blue charges are brought closer together? A. The net force on the black charge decreases, and the black charge moves slower toward the two blue charges. B. The net force on the black charge increases, and the black charge moves slower toward the two blue charges. C. The net force on the black charge decreases, and the black charge moves faster toward the two blue charges. D. The net force on the black charge increases, and the black charge moves faster toward the two blue charges. E. There is no change in the net force, or in how fast the black charge moves.
Explanation / Answer
7.
electric force is inversly propotional to distance . so as the ball comes closer , force increases.
B. increases
8.
Red ball on south of black ball repel it towards north
North
9.
the black ball push the red ball towards south direction
south
10.