It looks like upside-down conical beaker, with a small bottom and big open.

System Composition of llongwill^® Multi-purpose Mechanical Track:A. Track, B. Carts (red, yellow), C. Fixed Leg, D. I-type Bracket (Aluminum), E. I-type Bracket (Plastic) , F. L-type Bracket, G. Friction Block, H. Track Inclination Adjuster, I. Magnetic End Stop, J. Pulley, K. Magnetic Sheet, L. 50g Weight Block, M. 5g Weight Block, N. Light Blocking Sheet in width of 20,40,60,80mm O. Springs,P. Fasteners, Q. T type Track Support, R. Elastic Metal Ring, S. Kibble with String,T. Cart Absorber.

Components of llongwill^® Centripetal Force Apparatus: A. Main Frame, B. Base, C. Rotating Arm, D. Connecting Device (a bolt connected with the force sensor, a vertical rod and a horizontal rod), E. Weight , F. Light Blocking Rod, G. Fasten bolt: a bolt connected with the force sensor. 

Components: 

Precision Force Disc,  Hanging arm, Force Sensor Fixed Rod, Roller , Standard Block, Weight, Stand support .

Intelligent apparatus used with Force&Angle Sensor.

Real time obtain the angle data automatically, instead of manual input operation

1. Main Board, 2.Subboard, 3.Fixed Arm for Photogate, 4.Fixed Arm with magnetic clamp, 5.Pendulum Bob (include cord), 6.Position Stop, 7.Planometer, 8.Central Nut, 9.Central Bolt, 10.Fixed Bolt for Pendulum Line, 11.Butterfly Bolt, 12.General Bolt

Components:

Base，Sliding platform， Distance adjusting knob，  Fixing bolt，  Fixing post， Rubber band

Components: A. Base, B. L-type Rotating Arm, C. Angle Scale, D. Build-in Force Sensors —one in the long arm and the other in the short, E. T-type Rollers assembled on the top of force sensors , F. Cable Port for connection with data logger, H. Plastic ring used as a measured object

Components: A. Cotton Thread, B. Switch, C. Base, D. Fixed Rod, E. Friction Layer, F. Friction Block.

Components: A. Base, B. Bracket, C. Adapter, D. Track, E. Ball,F. Photogate, give the signal of timing end, G. Built-in touch sensor-give the signal of timing end, H. Magnetic Absorber—with built-in magnet, used to absorb the falling ball, I. Cable port for touch sensor built-in the base.

To measure the buoyancy acted on the sinking object.