Category Archives: Motion In One Dimension

Ballistics Car

Demo: ME-D-BC
Pira Index: 1D 60.10

 Lab Equipment  Directions
  1.  ballistics car
  2. lead or steel ball
  3. string and pin
  1.  Push plunger down and lock using pin.
  2. Place ball inside.
  3. Give the car velocity and hold string firmly to table surface. The string will then automatically pull the pin.
  4. The best results will occur when the velocity is not affected by the pin removal.


Strobed Water Drop

Demo: ME-C-WD
Pira Index: 1C 30.40

 Lab Equipment  Directions
  1.  Genrad strobotac
  2. special oscillating pump
  3. variac
  4. gallon water jug
  5. lab stand
  6. clamps: 2 – 90 degree, 1 hooked; 1 large 3-finger, 1 small 3-finger, 1 small 3-finger
  7. 3/4″ rod (approx. 1′)
  8. flexible tubing (approx. 10′)
  9. rubber bands
  10. funnel
  11. meter stick
  1.  Set up as shown. Attach rubber bands to the poles and to the hose to isolate the hose.
  2. Set the variac to 70 volts.
  3. Turn on the pump and the strobotac. Adjust the strobotac to about 3500 rpm until the water drops appear to stand still in space.


Velocity Vectors Car

Demo: ME-C-VV
Pira Index: 1C 10.10

 Lab Equipment  Directions
  1.  cart
  2. wooden channel
  3. toy truck
  1.  Place the wooden channel on top of the cart.
  2. Place the truck at one end of the channel.
  3. Give the truck a gentle push along the channel.
  4. As the truck is moving, move the cart perpendicular to the channel.


String and Weights Drop

Demo: ME-C-SW
Pira Index: 1C 20.20

 Lab Equipment  Directions
  1.  2 strings with attached washers
  2. Empty metal trash can
Notice: before putting this away, untangle the strings and wrap each set on one of the black plastic squares provided.
  1.  Hold on to the zero washer on the end of the pink string (evenly spaced washers). Hold the stretched out string as high as possible above the open trash can and drop the string into it. As each washer hits, notice how the clicks increase in frequency.
  2. Repeat with the string with the unevenly spaced washers (while string). Listen for evenly spaced clicks (a constant frequency).
The unevenly spaced washers are at placement lengths of 1, 4, 9, 16, 25, and 36 unit intervals.


Free Fall Timer

Demo: ME-C-FF
Pira Index: 1C 30.10

 Lab Equipment  Directions
  1.  Pasco free fall timer
  2. 3 finger clamp (leave it attached)
  3. plastic container with 2 steel balls
  4. meter stick
  5. tall lab stand
Notice: Test this prior to use. If the timer doesn’t trigger, clean inside the brass contact (where the ball is placed) with the pencil eraser.
  1.  Clamp the ball in the bracket with the set screw. (See small set of instructions in the box).
  2. Turn on and reset the timer.
  3. Place the platform under the ball.
  4. Measure the distance from the platform to the bottom of the ball, h.
  5. Loosen set screw until ball falls onto the platform.
  6. Read off the time, t.
  7. Using the equation g = 2h/t^2, calculate g.
When h=1m, t=.452


Falling Ball and Cup

Demo: ME-C-FB
Pira Index: 1C 30.17

 Lab Equipment  Directions
  1.  Hinged board with cup
  2. Ball
  3. Support stick
  1.  Raise the top board and hold it in place with the support stick. Balance the lead ball on the tee at the end of the board.
  2. Remove the support stick quickly. As the board falls the ball will land in the cup.
  3. Observe that the cup travels in a curve. The ball travels in a straight line from its starting position to the ground.


Dune Buggy, 1-D

Demo: ME-C-DB
Pira Index: 1C 10.10

 Lab Equipment  Directions
  1.  Dune buggy
  2. sheet of paper
  1.  Set up as shown.
  2. Pull the white sheet of paper in the opposite direction as the motion of the dune buggy.
  3. The dune buggy will appear to stay in the same place (subtraction of velocities).
  4. Pull the paper in the same direction as the motion of the dune buggy for addition of velocities.


Coin and Feather

Demo: ME-C-CF
Pira Index: 1C 20.10

 Lab Equipment  Directions
  1.  coin and feather tube (on wood back support)
  2. vacuum pump (not the air and vacuum pump)
Disconnect the pump after closing the rube valve.
  1.  Connect the vacuum hose to the tube. Use the wrench (attached to the back support of the tube) to open the valve at the bottom of the tube (make valve parallel to tube). Run the pump for about 30 seconds. Close valve (perpendicular to tube) and disconnect vacuum pump hose.
  2. Invert tube to show that the coin and feather drop at the same rate.
  3. Open the valve to let air enter.
  4. Invert the tube again to show that the two objects now do not fall at the same rate.


Book and Feather

Demo: ME-C-BF
Pira Index: 1C 20.11

 Lab Equipment  Directions
  1.  book (red manual)
  2. feather (red feather and tissue feather)
  1.  Drop each object separately and the feather will float down while the book accelerates rapidly.
  2. Drop both objects with the feather placed on top of the book and they will fall at the same rate.