Demos by PIRA

1A Measurement


1A50 Math Topics


1A60 Scaling


1C Motion In One Dimension


1C10 Velocity


  1C10.21Electric winch tows car at constant speed.
  1C10.27Airtrack: Glider passes "start" and "stop" gates on digital timer.

1C20 Uniform Acceleration


  1C20.10"Coin and Feather" fall in an evacuated rotatable tube.
  1C20.30Inclined airtrack with gliders and timing gates.
  1C20.31Acceleration of a steel ball down an inclined plane with metronome.

1C30 Measuring G


  1C30.10Timed free fall: Ball drops 2 meters through electronic timing gate.

1D Motion In Two Dimensions


1D10 Displacement in Two Dimensions


  1D10.20Cycloid disk draws path on chalkboard.

1D15 Velocity, Position, and Acceleration


  1D15.20Equal path lengths ball race.
  1D15.55Brachistochrone: Three balls falling along different trajectories.

1D40 Motion of the Center of Mass


1D50 Central Forces


  1D50.10A ball swung on a string held by a sleeve.
  1D50.25Conical pendulum: Similar to A+0+35 with standard weights.
  1D50.40Swing water in a bucket.
  1D50.70Rotating loop of chain rolls across bench.

1D52 Deformation by Central Forces


  1D52.10Flattening of the earth: Rotating brass hoops.
  1D52.35Mercury and colored water in a rotating glass vessel.
  1D52.40Candles rotating about an axis.

1D55 Centrifugal Escape


1D60 Projectile Motion


  1D60.10Ballistics car: Ball ejected from rolling car drops back in.
  1D60.20Dropped and shot balls hit bench simultaneously.
  1D60.30Monkey and the hunter.
  1D60.65Water projector: Adjustable angle water jet in front of grid.

1E Relative Motion


1E10 Moving Reference Frames


1E20 Rotating Reference Frames


1E30 Coriolis Effect


1F Newton's First Law


1F10 Measuring Inertia


1F20 Inertia of Rest


  1F20.10Breaking thread above and below weight.
  1F20.25Bed of nails
  1F20.30Tablecloth yanked out from under dishes.
  1F20.34Card snapped from under a weight by a leaf spring.

1F30 Inertia of Motion


1G Newton's Second Law


1G10 Force, Mass, and Acceleration


  1G10.10A falling weight accelerates a car horizontally.
  1G10.40Atwood machine: Unbalanced weights on a pulley accelerate slowly.

1G20 Accelerated Reference Frames


  1G20.60Film loop: "Inertial forces:Translational acceleration", 2:05 min.
  1G20.76Cork float accelerometer: Cork and water in sealed flask.

1G30 Complex Systems


1H Newton's Third Law


1H10 Action and Reaction


  1H10.10Two people in rolling chairs pushing and pulling

1H11 Recoil


1J Statics Of Rigid Bodies


1J10 Finding Center of Gravity


  1J10.09Rotation about the center of mass: Object to throw.
  1J10.12Irregular shapes to determine center of mass using plumb bob.
  1J10.26Center of mass of a baseball bat

1J11 Exceeding Center of Gravity


1J20 Stable, Unstable and Neutral Equilibrium


1J30 Resolution of Forces


  1J30.10Car hangs balanced by forces in mid-air over removable inclined plane.
  1J30.51Force table: Forces on a car on an adjustable inclined plane.
  1J30.53Force table: Forces on a car on a horizontal table.

1J40 Static Torque


  1J40.15Torque wrench to demonstrate.
  1J40.20A meterstick lever on a free-standing fulcrum with weights.
  1J40.25Precision lever: Balance beam on stand plus weight set.
  1J40.70Forces on crane boom measured with transducer.
  1J40.75Anatomical models: Skull, Arm, Leg

1K Applications Of Newton's Laws


1K10 Dynamic Torque


  1K10.30Static equilibrium for a rope on a spool. Same as A+55+5.
  1K10.30Rolling spool: String on spool is pulled at various angles.
  1K10.50Disk (weighted off-center) rolls up inclined plane.

1K20 Friction


  1K20.15Weighted wood block dragged horizontally by force sensor.
  1K20.35Blocks, with various surfaces slide on an inclined plane.

1K30 Pressure


1L Gravity


1L10 Universal Gravitational Constant


  1L10.10Film loop: "The Cavendish experiment", 4:25 min.
  1L10.30The Cavendish experiment: Model and actual apparatus to show.

1L20 Orbits


1M Work And Energy


1M10 Work


1M20 Simple Machines


  1M20.11Pulley sets.
  1M20.20Block and tackle: Bosun's chair.

1M30 Non-Conservative Forces


1M40 Conservation of Energy


  1M40.95The Trebuchet
  1M40.10Bowling ball pendulum swings back to nose.
  1M40.20Loop the loop: Sphere, hoop, disk rolled down a looped track.
  1M40.40Ballistic pendulum: Suspended .22 rifle fires into suspended block.
  1M40.40.22 rifle fires vertically, bullet lifts small wood cylinder.
  1M40.41Inelastic collisions: Another ballistic pendulum.
  1M40.50Maxwell's wheel: Flywheel with axle, supported on strings or stand.

1M50 Mechanical Power


1N Linear Momentum And Collisions


1N10 Impulse and Thrust


  1N10.55Waveguide pieces to show.

1N20 Conservation of Linear Momentum


  1N20.25Airtrack: Long track with two gliders coupled by a spring hoop.
  1N20.30Balls of equal and unequal mass on strings, separated by a leaf spring.

1N21 Mass and Momentum Transfer


1N22 Rockets


  1N22.20Rocket is filled with water and compressed air and launched vertically.
  1N22.30Carbon dioxide propelled rocket flies across room on wire.
  1N22.33Carbon dioxide propelled rotational device.

1N30 Collisions in One Dimension


  1N30.10Elastic collisions: Five hanging balls and two unequal hanging balls.
  1N30.15Elastic collisions: Seven steel balls roll on a wooden track.
  1N30.30Three meter airtrack with gliders that rebound elastically, or stick.

1N40 Collisions in Two Dimensions


  1N40.10Executive size pool table
  1N40.21Plastic pucks on air table.

1Q Rotational Dynamics


1Q10 Moment of Inertia


  1Q10.20Large torsion pendulum with different diameter rods.
  1Q10.40Two disks, one weighted in center and other on rim, roll down ramp.

1Q20 Rotational Energy


1Q30 Transfer of Angular Momentum


  1Q30.25Rotational inertia device: Sliding weights on rotating rod.

1Q40 Conservation of Angular Momentum


  1Q40.10Rotating chair with dumbbells or weighted bicycle wheel.
  1Q40.11Minor's apparatus: Movable discs rotated by falling weight.
  1Q40.23Mechanical governor device.
  1Q40.40Train on circular track moves one way and track moves the other.

1Q50 Gyros


  1Q50.40Large gyroscope in a suitcase.
  1Q50.54Sire's Polytrope.
  1Q50.90Maxwell's top, has adjustable center of gravity.

1Q60 Rotational Stability


  1Q60.15Large conical aluminum top.
  1Q60.50Chain lariat with hand drill or electric rotator.

1R Properties Of Matter


1R10 Hooke's Law


  1R10.10Standard pan balance with assorted weights.
  1R10.10Weight on a vertical spring with markers on stand.

1R20 Tensile and Compressive Stress


  1R20.15Young's modulus of elasticity: Weight stretches wire.
  1R20.70Prince Rupert's Drops.

1R30 Shear Stress


  1R30.20Shear: Foam block.

1R40 Coefficient of Restitution


  1R40.10Elasticity: Balls bouncing on steel or glass cylinder.

1R50 Crystal Structure


  1R50.20Wave surfaces of crystals.
  1R50.30Assorted crystals to show.