The demonstrator can be used in middle school’s physical classes to illustrate the resultant and resolution of vectorial forces, i.e. the parallelogram rule and the triagulate rule.
Structure and Technical Features
The demonstrator is composed of the following parts:
- Demonstrating plate, 500 mm?350 mm?18 mm, with a steel plate which is sprayed with plastic and used to attract the force indications.
- Two pulley forks are separately fixed on the left and the right side of the demonstrating plate by across screws. Loosing the across screws, the forks can by move vertically and then change the direction of the resultant.
- Two ropes, fixed with a force-show ring in their ends, can carry the hook weights and act as the resolutes.
- Cylinder vertical force meter
- Magnetic force indications
- Magnetic angle meter
- Max. Force measured: 4.9 N
- When force is loaded on the meter, a red-white scale will be pulled out form its bottom end. The length of the scale out of the end will represent a force at a rate of 2 cm for 0.49 N ( the tensile force produced by a hook weight with a mass of 59 g.)
- In the end of the scale a small hook with a rope-ring is installed, which can make the demonstration operation easily. The lower part of the scale can be removed and rotated, which can
make the location of the circular center easily.
- The meter clamp, installed on the demonstrating plate, can rotate freely and tightly.
- Magnetic vectorial indications are divided into three groups, with 3,4 and 5 sections separately. Each section has a length of 2 cm, which can be used to form a parallelogram.