1 Common exam Common Exam 1 Exam graded out of 16 problems so 2 problems are ‘extra credit’ Average (sections 14 and 16): 12.13 - mid-range B Low – 5 High.

1

Common exam

Common Exam 1

Exam graded out of 16 problems so 2 problems are ‘extra credit’

Average (sections 14 and 16): 12.13 - 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, [email protected] FRIDAYS 11:30-2:30pm   ROOM 409 TiernanMONDAYS 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, [email protected] Mondays Noon-2pm and Thursdays 10AM-1pm in Tiernan 401

Undergraduate TA: Griffin Snydersunday from 6pm-9pm - TBATuesday 10am-2pm - TBAWednesday 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=0B) The acceleration of m1 is equal to the acceleration of m2C) The masses do not move at allD) 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)

1 2m m1 2m m

1 2 sinm m

1 2 sinm m 1 2 sinm m

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 inclineB) The block is moving down the

inclineC) The block is not movingD) The block is sliding at constant

velocity up in the inclineE) None of the other answers are

correct

N

mgf

Friction forces in liquids

Circular Motion

Conical Pendulum

Conical Pendulum

0 20 40 60 80 1000

10

20

30

40

sin thetai

( )

2

cos thetai

( )

iAngle (degrees)

2sin ( )

cos( )

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 roadB) To increase the weight of the car on the roadC) The civil engineers were bored with flat road designsD) To increase the centripetal force which pushes the car in a circular

pathE) 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 mphC) Dodonpa – 107 mphD) Kingda Ka - 128 mph E) Formula Rossa - 149 mph