Class 36: Non uniform circular motion Course Evaluation: 1. Started - PowerPoint PPT Presentation

Class 36: Non ‐ uniform circular motion

Course Evaluation: 1. Started yesterday Apr 13 th , ends Dec 29 th (Wednesday). 2. Go to http://pa.as.uky.edu/ 3. Click at “UNDERGRADUATES” in the top menu and then choose the first item: Physics & Astronomy Course Evaluations 4. Follow instructions from there. 5. Make sure remember or write down any given key or password. You need this to re-enter the system if you cannot finish the evaluation in one time.

Test 2 St. Dev. Summary (whole class) Average (population) MC 1 3.500 2.29 MC2 4.250 1.79 MC3 3.500 2.29 MC4 3.929 2.05 MC5 2.464 2.50 MC6 2.107 2.47 MC7 2.786 2.48 MC8 4.429 1.59 MC Total (40 points) 26.96 8.76 Q 9 (30 POINTS) 24.68 8.01 Q 10 (30 POINTS) 22.74 7.48 Score 74.38 20.61 Total 140 students

Test 3 Range Grade No. Students 100 > x ≥ 90 A 30 90 > x ≥ 80 B 42 80> x ≥ 45 C 51 45> x ≥ 35 D 9 35 > x E 8 Total No. Students 140

Uniform circular motion – Example 3 In a circular track of radius R, the road is banked at an angle  . A car is running on it with a velocity v without slipping. Calculate the friction. v R

Non ‐ uniform circular motion – Example 1 T P R  h B Calculate the normal force acting on the particle when it is at point (i) B, (ii) P, and (iii) T. What is the minimum height to release the particle from rest for it the complete the circular path it there is nothing to keep it on the track.