PHYS 161 Exams

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Partial List of Topics Covered

Anything in the book or lectures/labs is also fair game

Test

Solution

Comment

Chapters 1-4

 1D, 2D & 3D motion

· Standard projectiles (ax=0)

· Projectiles with non-zero ax

· Tricky word problems requiring derivatives or integrals.  Remember: sometimes plugging in zero for a limit gives non-zero result!

1D motion graphs

· Use problem statement to create a graph

· Interpret graphs

· Distinctions between an xt-plot versus a vt-plot versus an at-plot

Vectors

· Ordinal directions (N of W versus W of N)

· Dealing with angles to the vertical versus angles to the horizontal

· Addition (graphical or with SOH CAH TOA)

· Cross & dot products

· Creating unit vectors

· Angle between two vectors

· Angle between vector and an axis

Sig figs & math with sig figs

Prefixes & Notations

· Scientific versus engineering

· Be able to go from power of 10 to prefix

· Be able to go from prefix to power of 10

· WATCH OUT! Use either prefix or power of 10 BUT NOT BOTH!!!

Relative motion

161sp20t1a

161sp20t1aSoln

 

161sp19t1a

161sp19t1aSoln

 

161sp18t1a

161sp18t1aSoln

 

161sp17t1a

161sp17t1aSoln

 

161sp15t1a

161sp15t1aSoln

 

161fa14t1a

161fa14t1aSoln

 

161fa13t1a

161fa13t1aSoln

 

161fa10t1a

161fa10t1aSoln

 

 161discussion01.pdf

NA

Solutions to each question at end of same file.

Chapters 5-8

Excel or other computation

Newton’s Laws

· Frictionless force problems (often multi-block)

· Friction force problems (often multi-block)

· Circular motion force problems

· Tricky concept questions

Work-energy theorem (Ch 7 methods)

Work done by non-constant force using integral

Determine force from potential energy

Determine potential energy from force

· Remember: sometimes plugging in zero for a limit gives non-zero result!

Energy problems (Ch 8 methods)

Know these tricks:

· Determining height of circular arc

· Determine height on incline

· For two blocks use two GPE reference levels

· Use FBD to determine n & f so you can get Wfriction

· Often useful to do circular motion FBD for energy problems with circular tracks or loops

· If spring is changing length in problem, we typically use energy (because spring force & acceleration are NOT constant)..  Do NOT use constant acceleration kinematics if spring length is changing in problem!

· If spring at fixed length for entire problem, we often can use Fspring=kx in an FBD

· Use period, speed, &/or omega interchangeably for circular motion

161sp19t2a

161sp19t2aSoln

 

161sp18t2a

161sp18t2aSoln

 

161sp17t2a

161sp17t2aSoln

 

161sp15t2a

161sp15t2aSoln

 

161fa14t2a

161fa14t2aSoln

 

161fa13t2a

161fa13t2aSoln

 

161fa10t2a

161fa10t2aSoln

 

 161discussion02.pdf

NA

Solutions to each question at end of same file.

Chapters 9-12

 Momentum and Impulse

· 1D elastic

· 1D or 2D inelastic

· Explosions

Center of Mass & Moment of Inertia

· If calc required, expect a 1D problem

· If calc NOT req’d, could be any dimensionality, could have holes, could require parallel axis

· Perpendicular axis might be extra credit

Rotational Kinematics

· Constant angular accel

· Non-constant angular accel

· Plots

· Know a, ac, atan & atotal

Relating Rotational & Translational Motion

Torque & Energy Methods for:

· Rolling Motion (without slipping)

· Blocks with Massive Pulleys

· Swinging Motion*

*WATCH OUT!  In most swinging motion problems you CANNOT use constant acceleration kinematics (while most rolling or blocks w/ pulley you CAN).

Angular Momentum

· Rotating object changes shape (e.g. neutron star, figure skater brings arms in).

· Rotating object impacts rotating object (e.g. drop spinning disk on spinning turntable)

· Collision in space without pivot:  Usually both angular and linear momentum conserve.  After collision rotates about center of mass.  Often need parallel axis theorem to get moment of inertia. 

· Collision with pivot: Usually only angular momentum is conserved.  After collision rotates about pivot.

· For points masses moving in straight line use mvr_perp. 

· For points masses attached to something spinning use I_pointmass=mx^2.

· Don’t forget: angular momentum could be + or -!!!

Which conservation laws apply?

Static Equilibrium

Stress & strain (1D Young’s modulus)

161sp19t3a

161sp19t3aSoln

 

161sp18t3a

161sp18t3aSoln

 

161sp17t3a

161sp17t3aSoln

 

161sp15t3a

161sp15t3aSoln

 

161fa14t3a

161fa14t3aSoln

 

161fa13t3a

161fa13t3aSoln

 

161fa10t3a

161fa10t3aSoln

 

 161discussion03.pdf

NA

Solutions to each question at end of same file.

Final exam questions from Ch 13 & 14

Ch 13—Universal gravitation

· Circular orbit do FBD &/or KE & GPE

· Conservation of energy (Escape velocity, release four point masses from rest, etc)

· Place point masses on grid.  Get net force on one of the masses.  Remember that you must add force VECTORS not force MAGNITUDES.

· Place point masses on a grid.  Get gravitational potential energy.

Ch 14—Fluids & Pressure

· Buoyant force

· Static pressure versus depth (U-tubes or force on a dam)

· Ideal fluid flow problems using continuity equation &/or Bernoulli equation (e.g. siphon or hole in a can)

· Sometimes throw in a 1 pointer from all the weird demos...not worth stressing over.

161sp20t2online

Covers Chapters 5-10

161sp20t2onlineSoln

Available After Last Oral Exam Late Thursday Night