Author: aneat1

aneat1

Loop the Loop

 

Loop the Loop Demo Picture

  • Purpose: Use concepts of gravitational, rotational, and kinetic
    energy to calculate height at which ball must be released to just remain in
    contact with track as it loops the loop.
  • Located in L02, section B3. Balls located in L02, section
    A1.

 

 

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High/Low Road

 

High/Low Road Demo Picture

  • Purpose: Demonstrate properties of gravitational potential
    energy.
  • Though balls start and end at same height and with same velocity,
    ball on longer track traverses path more quickly.
  • Located in L02, section B2

 

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Spring Loaded Cart

 

Spring Loaded Cart Demo Picture

  • Located in L02, section B1.
  • Place metal plates (two) on track end stops and seperate
    end stops by about 5 cm (as shown above); place spring on launcher shaft and
    insert launcher shaft through holes in metal plates, compressing spring. Small
    pin on string allows for quick, frictionless release.
aneat1

Turntable

 

Turntable Demo Picture

  • Used in uniform circular motion lab, coeficient of static
    friction is calculated and then used to predict maximum rpm at which car will
    remain on table.
  • Adjust rpm with 5 amp, regulated DC power supply.

Location

  • Turntable and car in L02, section B4.
  • Power supply in L35, section F1.

 

aneat1

Block on Cylinder

Block on cylinder demo picture

  • Purpose: Demonstrate principles of stability.
  • Balance styrofoam block (with pencils removed) on pvc cylinder
    (non-velcro side to non-velcro side). Block is stable if balanced wide-base-down, and unstable if balanced thin-base-down. To demonstrate the relationship between the stability of the block and the location of its center of mass: insert a pencil into the block, as shown above; place the block onto the cylinder (velcro to velcro) such that the pencil makes contact with the attached paper; carefully rock the block back and forth to get a smooth pencil trace on the sheet of paper. The pencil trace represents the height of the block’s center of gravity as a function of angle. (The velcro simply keeps the block from slipping while making your trace). In theory, the block should balance if the height of the block is smaller than the diameter of the cylinder, and shouldn’t balance if the height of the block is larger than the diameter of the cylinder (assuming density of block is uniform).
  • Located in L02, section B4

 

aneat1

Overhang Blocks

 

Overhang blocks demo picture

  • Demonstrate how center of mass is related to stability.
  • By increasing the number of blocks in the stack, blocks can
    be extended (surprisingly) an indefinite distance along the x axis.
  • Located in L02, section B4.

 

aneat1

Helicopter

Helicopter

 

Use when discussing Newton’s 2nd or 3rd law.

3rd Law: Helicopter pushes on air, air pushes back on helicopter, causing it to rise.

2nd Law: When helicopter ascends with constant velocity net force on helicopter is not up, or down, but zero.

  • Throttle on left hand side of paddle controls up and down motion.
  • Forward/backward, and left/right are a little tricky.
  • Practice before using in lecture. Helicopter can be recharged via USB (see yellow USB plug). Remote control requires batteries.

Lots of fun!

 

 

 

aneat1

Paradoxical Force

 

Paradoxical force demo picure

Paradoxical force demo picture

  • Spring Scale is connected to two hanging weights. Many students
    predict that the value of the scale reading will be the sum of the two weights, not simply the value of one- hence the name “paradoxical”, I guess.
  • Located in L02, section B4. Scales and weights in section
    A1.

 

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Tug-o-War

 

Tug-o-war demo picture

Tug-o-war demo picture 2

  • Hang two masses of equal weight, connected
    to opposite sides of spring scale, over pulleys, as shown above. Scale reading is that of one weight. Masses in above picture equal 200 grams.
  • Located in L02, section B-4, top shelf.
  • Weights located in L35, section D-1.

 

aneat1

Fan Cart

 

Fan cart demo picture Fan cart demo picture 2

  • Demonstrate Newton’s 2nd and 3rd law.
  • Cart without plate attachment (left image) accelerates when
    fan is engaged; cart with plate attachment will not accelerate.
  • Located in L02, section B4.

 

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Visual Accelerometer

 

Visual Accelerometer demo picture

  • LEDs indicate magnitude and direction of acceleration.
  • Some Applications:

* Study acceleration of simple harmonic motion

* Measure acceleration due to gravity

* Study acceleration of elevator

* Study acceleration of cart rolling freely up and down incline.

  • Located in L02, section B1.

 

aneat1

Force Plates

 

Force plates demo picture

  • Use in conjunction with Logger Pro to measure forces in real
    time. Use graphical analysis in Logger Pro to demonstrate Newton’s Laws. Durable
    enough to leap from or push heavy objects.
  • Located in L02, section B3, in plastic tub.

 

 

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Hook’s Law

 

Hook's law demo picture

Hook's law demo picture 2

  • Set contains meterstick with metal hook, spring with needle indicator, and clamp.
  • Clamp the meter stick to a ring stand as shown in the above photo. Extension length is easily read.
  • Located in L02, section D-2.

 

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Hover Craft

 

Hover craft demo picture

  • Demonstrate Kinematics of frictionless motion; experiment
    with Newton’s 2nd Law; study conservation of momentum.
  • Sit on craft with center of gravity directly over center
    of disk; make sure battery is charged to full capacity.
  • Located in L02.

 

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Ballistic Cart

Ballistic cart demo picture

  • Purpose: Demonstrate principles of Galilean relativity and
    projectile motion.
  • Place ball in spring loaded launcher; set cart in motion;
    launcher is triggered by photogate as cart passes trigger bracket; ball travels
    in parabola and lands back in cart.
  • Located in L03, section B3. Track in section B2.

 

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Blackboard Mechanics

 

Blackboard mechanics demo picture

  • Perform various experiments dealing with static equilibrium,
    resolution of concurrent forces, levers, torque, inclined planes, mechanical
    advantage, pulleys, physical pendulums, spring systems, center of mass, and
    friction.
  • Mount on blackboard surface by means of magnets: levers,
    inclined plane, pulleys, simple machines, roller, friction block, weights,
    springs and scales. Check out the Klinger
    website for ideas.
  • Located in L02, section B4

 

aneat1

Pen, Hoop, & Bottle

 

Pen, hoop and bottle demo picture

inertia hoop 2

  • Balance the hoop on the glass bottle as shown. Carefully
    place the marker on top of the hoop, directly over the mouth of the bottle.
    Swipe the hoop out from underneath the marker with one, quick, horizontal motion. Marker should fall directly into bottle.
  • The two tricks to doing this demo successfully are: 1) placing
    the marker directly over the mouth of the bottle, and 2) making quick, horizontal swipe.
  • The hoop is marked on the outer and inner rim to help with marker and hoop placement, and a plumb bob is suspended to indicate vertical.
    Practice a few times before using it in class. Make sure swiping motion is totally horizontal.
  • Located in L02, section B3.

 

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Smash Your Hand

 

Smash your hand demo picture

Smash your hand demo picture

  • Demonstrate inertia of rest.
  • Lay your hand flat on a table top then gently rest a lead brick on top of it, being careful not to placing too much weight on the knuckles. Strike the top of the brick with the hammer. If done properly, demonstrator should be able to hit with nearly full force without hurting hand. Please practice before performing in class using light blows, then steadily increase force.
  • Alternatively, rest lead brick on a piece of hard candy, then whack with hammer.
  • Lead brick absorbs the blow, leaving the candy (or hand) undamaged.
  • Located in L02; section B3.
  • Lead brick in demo room is covered with duct tape for safety
    and ease of use.