Mechanics

Ball Launcher with Holder

Typical Results for 20 Shots. L = distance (here 4.5 m).

Ball Launcher (or projectile launcher), 650267:

• 3 ejection velocities can be selected
• the placement of the ball can be seen through holes in the cylinder
• ranges at 45° und height difference = 0: 1,1 m, 2,3 m and 4,5 m (approx.)
• reproducibility at 45°: standard deviation is smaler than 1%
• nearly rotation free launching of the ball
• launch angles: 0° to +90°
• constant launching height at any launching angle because the pivot point is also the launching point
• adjustable scale
• threads at the bottom side for e.g. a light barrier
• for safety the spring mechanism is closed and the balls are made of plastic
• the bounce of the plastic balls on the table is so weak that there will be no damage normally
• additionally needed:

  Holder for Ball Launcher, 650275

  or Ballistic Pendulum (see below)

Instruction sheet for further information: Ball-Launcher.pdf (116 kB)

Ballistic Pendulum

Experimental and Calculated Flight Path (enlarge figure)

Ballistic Pendulum, 650273:

• lightweight pendulum - no steel balls necessary
• estimated ball velocities from launch experiments are equal to those from pendulum experiments within ±3 %
• with add masses the influence of pendulum mass can be determined
• elastic (quantitatively) and inelastic (qualitatively) collisions can be carried out
• launch experiments are possible with 5 fixed launch heights: 5, 10, 15, 20, and 30 cm
• table clamp with a span of 65 mm
• made of anodized aluminium

Instruction sheet for further information: Ballistic-Pendulum.pdf (129 kB)

Pressure Balance

Pressure Balance, 650274:

• for simple experiments according to the force and pressure definitions: F=p*A
• ratio of the piston areas: 10 : 3
• ratio of the piston masses including pan: 10 : 3
• includes 15 masses (each approx. 40 g)
• locking wire for the smaller piston
• precision glass syringes (10 ml and 50 ml)
• stand is made of anodized aluminium
• base plate dimensions: 140 mm x 100 mm

Instruction sheet for further information: Pressure-balance.pdf (120 kB)

Free Fall Apparatus

Details

Free Fall Apparatus, 650278:

• for the estimation of the acceleration due to gravity g from falling time
• typical results:
  

  height / m	time / s	g (calculated) / (m/s^2)
  0.1	0.142	9.92
  0.2	0.202	9.80
  0.4	0.287	9.71
  0.6	0.351	9.74
  0.8	0.406	9.71

• falling height: 2 to 80 cm
• pure mechanical construction with micro switches - no special stop-watch necessary
• during the fall the electric circuit is closed (jacks with 4 mm diameter)
• stand is made of anodized aluminium
• dimensions: 22 cm x 22 cm x 90 cm
• including 2 steel balls with 17 mm diameter

Motor/Generator

The motor is used as alternator

Motor/Alternator, 650280:

• robust motor with planetary gear and quick-catch chuck
• nominal voltage 12 V, no-load speed approx. 480 turns/min
• variable-voltage control: approx. 40 turns/(Volt*min)
• variable torque
• for shafts with 0.8 to 10 mm
• durable case (60 mm x 60 mm) made of anodized aluminium
• stainless steel shaft with 12 mm diameter
• motor can be mounted at the holder for the Ball Launcher, 650275
• mass = 1,2 kg
• including: motor with shaft, crank (for use as Alternator), pulley with 3 diameters

Instruction sheet for further information: Experiment-Motor-en.pdf (140 kB)

Currently not available!