Category Archives: Statics of Rigid Bodies

Normal Force

Demo: ME-J-NF
Pira Index: 1J 30.15

Lab Equipment  Directions
  1. 1000g weight
  2. digital balance
  3. blue incline plane
  1. Tape down the digital balance to the incline plane.
  2. Zero the balance before taping down 1000g weight on top of it.
  3. Raise incline and watch weight change.

Torque Wheel

Demo: ME-J-TW
Pira Index: 1J 40.25

 Lab Equipment  Directions
  1.  small lab stand
  2. 90 degree clamp
  3. torque wheel apparatus with colored strings attached to each wheel
  4. hooked brass weight set
  5. 1 extra 100g hooked weight
  6. ruler
  1.  Set up as shown.
  2. Place a 100 gram mass on the right string and also one on string A to show 1:1 ratio.
  3. Move the weight hanger from A to B and select appropriate weight to balance.
  4. Repeat #3 for positions C and D.


Torque Beam and Masses

Demo: ME-J-TM
Pira Index: 1J 40.40

 Lab Equipment  Directions
  1.  2 pan balances
  2. metal channel bar or lightweight board
  3. 2 2kg masses
  4. 2 aluminum angle brackets
  1.  Note the reading of each scale when only the track, no masses, rests on them.
  2. Place a mass over each balance as shown and note the balance readings.
  3. Move one of the masses so taht both set above one balance as shown. Note the reading of the balances.


Torque Beam and Cart

Demo: ME-J-TC
Pira Index: 1J 40.40

 Lab Equipment  Directions
  1.  2 pan balances
  2. Pasco scientific track
  3. Pasco cart
  1.  Note the reading of each scale when only the track, no cart, rests on them.
  2. Place the cart on the middle of the track and note each balance reading.
  3. Push the cart toward one of the scales and note the change in each reading.


Torque Bar

Demo: ME-J-TB
Pira Index: 1J 40.10

 Lab Equipment  Directions
  1.  torque bar apparatus
  2. hooked masses
  1.  Grasp the torque bar handles with both hands, palms down.
  2. Hold torque bar in a horizontal position.
  3. Hang one mass on the hooks at various positions and attempt to hold bar in a horizontal position.
  4. Repeat step 3 for other masses.


Statics of a Rigid Body

Demo: ME-J-SO
Pira Index: 1J 40.41

 Lab Equipment  Directions
  1.  three lab poles
  2. two telescope clamps
  3. two Newton dial scales
  4. two 90 degree clamps
  5. two small C-clamps
  6. meter stick
  7. two weight hangers (large)
  8. four large 1kg masses (silver)
  9. small level
  1.  Set up the lab poles and meter stick as shown.
  2. Set the scales to zero newtons.
  3. Hang the scales on the rod using the C-clamps.
  4. Hang the meter stick on the scales.
  5. Hang the weight hangers on the stick.
  6. Place various amounts of mass on hangers, adjust their positions to level meter stick if desired.
  7. Observe the readings on the dial scales and calculate forces and torque.


Simple Machine/Force Magnifier

Demo: ME-J-SM
Pira Index: 1J 30.30

 Lab Equipment  Directions
  1.  6 one-kilogram masses
  2. string
  3. simple machine apparatus
  1.  Set up the apparatus as shown.
  2. Measure the distance between the two supports, “d.”
  3. Place a 1kg weight on the top.
  4. Continue placing weights on the machine until the string breaks.
  5. Now increase or decrease the distance “d” and repeat steps 2-3. Note the change in the amount of weight needed to break the string. What is the relationship?


Paradox Balance

Demo: ME-J-PB
Pira Index: 1J 40.45

 Lab Equipment  Directions
  1.  Paradox balance
  1.  Set up the balance with all weights at their outermost positions.
  2. Move the end weight on one side towards the center. (A-balanced)
  3. Replace that weight and move the other end weight towards the center (B-balanced)
  4. Move both end weights toward center. (C-balanced)
  5. Move one center weight towards the center. (D-unbalanced)