1 Common exam Common Exam 1 Exam graded out of 16 problems so 2 problems are ‘extra credit’ Average (sections 14 and 16): mid-range B Low – 5 High – 18 Estimated grades posted. LOTS of A’s, mostly B and above. A few F’s…… Generally, these students are not doing HW assignments

More Tutoring Available TA: Phil Lo, FRIDAYS 11:30-2:30pm ROOM 409 MONDAYS 2:30-5:30pm Room 409 Tiernan EXCEPT weeks that we have common exams. the Saturday BEFORE the exam from noon-3pm, also in Room 409Tiernan. Undergraduate TA: Lucas Lamb, Mondays Noon-2pm and Thursdays 10AM-1pm in Tiernan Undergraduate TA: Griffin Snyder sunday from 6pm-9pm - TBA Tuesday 10am-2pm - TBA Wednesday 9am-12pm – 409 Tiernan

Iclicker Question #1 If these movable masses connected through a pulley (pulley and incline surface are frictionless), what condition should be applied if the masses are in equilibrium? A)The acceleration of m1=0 B)The acceleration of m1 is equal to the acceleration of m2 C)The masses do not move at all D)The masses move with the same constant speed. E)Is this going to be on the exam?

Iclicker Question #2 Under what condition will mass m2 move UP the incline. A) B) C) D) E)

Origin of Friction

Static versus Kinetic Friction

Iclicker Question #1 You push and hold a book against the wall. Which of the following free body diagrams represents the forces acting on the book: (a) (b) (c) (d) (e)

Iclicker Question #2 Based on the following free body diagram, which of the following statements is correct? A)The block is moving up the incline B)The block is moving down the incline C)The block is not moving D)The block is sliding at constant velocity up in the incline E)None of the other answers are correct

Friction forces in liquids

Circular Motion

Conical Pendulum

Angle (degrees) As velocity of mass increases, angle increases, and pendulum mass increases its radius of orbit.

Iclicker Question #3 Why are the turns of highway roadways banked? A)To increase the force of friction of the tires on the road B)To increase the weight of the car on the road C)The civil engineers were bored with flat road designs D)To increase the centripetal force which pushes the car in a circular path E)To decrease the weight of the car on the road

Friction on a Flat Road

Centripetal versus centrifugal forces

Banked Curve

Iclicker Question #4 Which is the following is the fastest roller coasters in the world? A)El Toro at Six Flags Great Adventure (US) B)Top Thrill Dragster at Cedar Point (US - Ohio) C) Dodonpa at Fuji-Q Highland (Japan) D) Kingda Ka at Six Flags Great Adventure (US – New Jersey) E) Formula Rossa at Ferrari World (United Arab Emirates)

Iclicker Question #4 Which is the following is the fastest roller coasters in the world? A)El Toro – 70 mph (fastest wooden roller coaster) B)Top Thrill Dragster – 120 mph C) Dodonpa – 107 mph D) Kingda Ka mph E) Formula Rossa mph