1. Rotational and Circular motion

2. Lady bug activity directions:
In this activity, you must include values that you measure and show sample calculations to support your answers to the questions. Include examples that use both bugs in different locations.

3. Sample calculations include:
Equation: PE=mgh
Substitution: PE = .50*9.81* 2
Answer with units: J

4. 1. A bug is spinning on a platform with constant speed, what was the direction of acceleration at the blue point? D A C B
Beginning of test
End of test
E none of these
Velocity is the green vector

5. Answer to previous slide
Beginning of test
End of test
A: acceleration vector always points radially for constant speed

6. From Dubson 2010 fall 2007 (college version of same question)
A to left
CT cir 1

7. Ct 1 cir answer

8. 2. A bug is on a platform spinning clockwise & speeding up
2. A bug is on a platform spinning clockwise & speeding up. Which best shows the bug’s acceleration direction at this spot? C B A B E D

9. Answer to previous slide
B: If the acceleration is constant and increasing, the vector will be not radial, but off to the same side of the radius as the velocity vector.
Also show next slides from college class to see vector answer.

10. ctrot3

11. Ctr rot 3 ans E

12. 3
3. Crt Rot 1

13. CRT rot 1 ans C, B

14. CRT rot 1 answer explanation 1
Lady bug not really v=0, just rounded.

15. 4
4. CTcirc 3

16. Ct circ 3 ans c

17. 5
5. CTR rot 2

18. Ctr rot 2 ans
Make a challenge to have the students use either Lady Bug or Torque to make slides of explanations for these questions.