Questions and Answers > PHYSICS SCI4445_Physics Web Search: Rotational Motion.

downloaded from

Scholarfriends

https://scholarfriends.com Downloaded by: writerforacademic@gmail.com | https://scholarfriends.com/singlePaper/275879/questions-and-answers-physics-sci4445physics-web-search-rotational-motion Distribution of this document is illegal.

Physics Web Search: Rotational Motion

Name_________________________ Period ________________________

Open the Physics Animations Folder Open motion-2d ( http://phet.colorado.edu/simulations/sims.php?sim=Motion_in_2D ) 1. Click “Show Both” at the top, and “Circular” at the bottom 2. Which color vector represents velocity, and which represents acceleration?

Circle: Velocity = Green or Blue specifically, tangential or angular?

Acceleration = Green or Blue specifically, tangential, radial, or angular?

Open rotation ( http://phet.colorado.edu/simulations/sims.php?sim=Ladybug_Revolution ) 1. Set the angular velocity to 90°/sec 2. Hit play, and notice the size of the green velocity vector and pink acceleration vector.

3. Reset, and move the lady bug to the very edge of the platform.

4. Set the angular velocity back to 90°/sec 5. What happens to the velocity vector? _____It becomes larger_____ What happens to the acceleration vector? ____It grows to a smaller degree than velocity 6. Use the ruler to determine the distance of the lady bug to the axis of rotation. (Assume each numbered division is a cm, not a meter). r = ___3.4 cm________ 7. Calculate the tangential speed v = ωr (be careful of angle units): .053 m/s 8. Calculate the radial acceleration: .084 m/s2 9. What is the tangential acceleration?

0 m/s2 10. Click the tab at the top left that says rotation 11. Set the angular velocity = 90°/sec.

12. Sketch the graph of the Angle, and the graph of Angular Velocity. (Don’t worry about numbers, just give the shape of the graph)

This study source was downloaded by 100000859458211 from CourseHero.com on 01-05-2023 21:34:00 GMT -06:00

https://www.coursehero.com/file/48871448/Rotational-Motion-Web-Questdoc/

13. Reset all 14. Click the third option down on the right under “Show graphs” (θ, ω, v) 15. On the Velocity graph, click all three boxes: Show speed, show X - Vel, show Y - Vel 16. Set the angular velocity = 90°/sec.

17. Graph all three lines in the velocity graph

18. What relationship can you make about the red, blue, and green lines? (Stop at any point and use the given numbers to verify your answer).

The green line remains constant (horizontal) because it is the square root of the sum of the squares of the blue and red lines. The blue and red lines are the same graph just shifted horizontally.

19. Reset all 20. Click the second option down on the right under “Show graphs” (θ, ω, α) 21. Set the angular acceleration = 30°/sec2.

22. Sketch the graph of the Angle, Angular Velocity, and Angular Acceleration (Don’t worry about numbers, just give the shape of the graph)

23. Reset all 24. Click the forth option down on the right under “Show graphs” (θ, ω, a). Check “Show Acceleration.”

25. Set the angular velocity = 90°/sec.

This study source was downloaded by 100000859458211 from CourseHero.com on 01-05-2023 21:34:00 GMT -06:00

https://www.coursehero.com/file/48871448/Rotational-Motion-Web-Questdoc/

26. Why does the acceleration remain constant despite the changing direction of the lady bug?

The velocity and radius remain the same, so acceleration is constant.

This study source was downloaded by 100000859458211 from CourseHero.com on 01-05-2023 21:34:00 GMT -06:00

https://www.coursehero.com/file/48871448/Rotational-Motion-Web-Questdoc/ Powered by TCPDF (www.tcpdf.org)