Category Archives: Oscillations

Wilberforce Pendulum

Demo: OW-A-WP
Pira Index: 3A 70.10

 Lab Equipment  Directions
  1.  Wilberforce pendulum
  2. large lab stand
  3. short cross rod
  4. 2 – 90 degree clamps
  1.  Attach cross bar to lab stand using one of the 90 degree clamps.
  2. Attach the pendulum to the cross bar using the other 90 degree clamp.
  3. Pull the pendulum down and release.
  4. The vertical harmonic motion will change to rotational motion, then back again.


Standing Waves Spring

Demo: OW-A-SS
Pira Index: 3A 60.40

 Lab Equipment  Directions
  1.  lab stand
  2. vibrator
  3. wooden crossbar
  4. spring
  5. 90 degree clamp
  6. pasco frequency generator
  7. 2 BB leads
  1.  Hook leads between generator and vibrator.
  2. Set the wave shape to ‘sine’ shape and the amplitude low. Set the frequency multiplier to 10x.
  3. Turn on the function generator and adjust the frequency to get different states of resonance.
Caution: too high of amplitude will blow the fuse.


Simple Pendulum

Demo: OW-A-SP
Pira Index: 3A 10.10

 Lab Equipment  Directions
  1.  lab stand
  2. pendulum clamp
  3. ball on a string
option: second ball with different mass than the first
  1.  Hang the pendulum from the clamp.
  2. Use the oscillation of the bob to discuss simple harmonic motion.
option: the period of oscillation may be measured at various release angles, with bobs of various masses, and with various lengths of string to determine which factor affects the period of oscillation of the pendulum


Springs Horizontal

Demo: OW-A-SH
Pira Index: 3A 20.40

 Lab Equipment  Directions
  1.  double set of springs with styrofoam ball attached in middle
  2. Pasco scientific track (hangs on screw)
  3. Pasco dynamics cart (red or blue) with 2 mass bars
  4. 2 springs from air track set
  5. long wood board
  6. 2 telescope clamps
  1.  Attach a clamp to the back side of the board on each end. Take out the top screws of the clamps then replace using them to secure the end rings of the springs.
  2. Set cart on the track and place a spring through the hole on each end of the cart. Secure the other ends of these springs to the ends of the track.
  3. Pull the ball toward one end and release.
  4. Pull the cart toward one end and release.


Spring and Pendulum Frequency

Demo: OW-A-SF
Pira Index: 3A 40.00

 Lab Equipment  Directions
  1.  3 springs with same k value
  2. 3 pendulum with bobs of similar size
  3. lab stand
  4. 90 degree clamp
  5. short horizontal pole
  6. 2 ring clamps with hooks
  7. pendulum clamp
  8. 2 – 1kg, 1 – 2kg, 1 – 500g hooked masses
  9. meter stick
  1.  Attach a spring to each clamp with 1 kg mass. Oscillate and observe similar frequencies. Put 2 kg on one spring. Have one group count frequency for the 1kg; another group count the 2kg – this group calls out when they get to 10 oscillations. The other group will be at 14, supporting the ‘square root of 2′ relationship shown in equation 1 below.
  2. Repeat with 2 springs in series and 1kg mass and compare to 1 spring with same mass as shown.
  3. Repeat with pendulum – 3 special lengths.


Speaker Dampening

Demo: OW-A-SD
Pira Index: 3A 50.00

 Lab Equipment  Directions
  1.  2 speakers (Auratone) with phono-DB adaptors
  2. oscilloscope (Philips)
  3. Pasco student function generator
  4. 2 BNC-F to DB-m adaptors
  5. BNC to BNC lead
  6. 2 BNC to DB leads
  1.  Connect the equipment as shown. Position the speakers face to face.
  2. Set the function generator on a square wave at approximately 10Hz and low amplitude.
  3. Set the scope as follows (settings will show on toggle B switch to 10mV, toggle MTB to 2mS, push Trig or X source button to ext DC.
  4. Look for a decaying wave pattern on the oscilloscope as shown.


Resonant Water Basin

Demo: OW-A-RW
Pira Index: 3D 40.00

 Lab Equipment  Directions
  1.  Chinese resonance basin
  2. Plexiglas base (with rubber feet)
  3. water
  1.  Place the basin on top of the plexiglas base.
  2. Fill the basin approximately half full of water.
  3. Wash your hands with soap and rinse well. Start moving hands back and forth in opposite directions across the copper handles until a pattern of resonant sprays of water is seen.
  4. Vary the frequency for different disturbance patterns.


Resonance Blocks

Demo: OW-A-RB
Pira Index: 3A 60.00

 Lab Equipment  Directions
  1.  blocks on 2 x 4
  1.  Move 2 x 4 block back and forth to resonate the tallest block.
  2. Notice the others barely move.
  3. Move the 2 x 4 block faster and get the next to the tallest to move.
  4. Again increase speed to set the shortest two in motion.


Projected SHM

Demo: OW-A-PS
Pira Index: 3A 40.10

 Lab Equipment  Directions
  1.  rotating platform
  2. rotating platform weight (heavy)
  3. special cut cardboard with butcher paper insert taped in
  4. showcase bulb with base
  5. bungee (strap around middle of cdbd)
  6. extension cord for lamp
  1.  Setup as shown below. Turn down room lights.
  2. Hold lamp back from cart to cast shadow on the paper screen.
  3. Rotate platform slowly so that students see the SHM shadow on the screen.
  4. Turn the cart around so the students can see the other side of the screen.


Pendulum, Physical

Demo: OW-A-PP
Pira Index: 3A 15.10

 Lab Equipment  Directions
  1.  lab stand
  2. clamp with wood and nail hanger
  3. irregular shaped peg board
  4. chalk
  5. plumb bob or mass on a string
  1.  Hang the peg board on the nail from some random hole.
  2. Hang the plumb bob from support hole and mark its path using the chalk.
  3. Repeat steps 1 and 2 until an intersection of lines is achieved.
  4. Mark this spot as the center of mass.