Item Type: Toy Product Name: Pendulum Instrument Toy Type: Puzzle Assembly Product Size: Approx. 10 x 10 x 20cm / 3.9 x 3.9 x 7.9in Product Packaging Size: Approx. 13 x 24.5 x 3cm / 5.1 x 9.6 x 1.2in Product Net Weight: Approx. 61 g Material: Wooden DIY: Yes Packing: Opp Ziplock Bag Ability Development: Intellectual Development Science and Education Toy Type: Physical Class Applicable Age: 5 Years Old Or Older Knowledge Card: The watch test stand is a teaching experiment instrument made by the principle of pendulum inertia. Through various swinging experiments on the weight of the objects on the rope, the magnitude of the external force and the length of the rope, it is possible to visually observe the amplitude of the swing, the number of swings and the swing time of the object under the combined action of external force, gravity and inertia. The larger the external force, the longer the rope is dropped, the heavier the object, the larger the swinging amplitude of the object, the longer the swing time, and the slower the speed. 1、Primary school students' DIY pendulum instrument toys, through different shapes and combinations, cultivate the baby's cognition of the pendulum instrument and stimulate creativity. 2、Pendulum instrument physical science experimenter, health and environmental protection, scientific and educational. 3、Small production toys can arouse the child's curiosity and develop the child's hands-on ability. 4、Scientific and rational settings can cultivate children's cognitive ability, observation ability, memory ability, understanding ability, coordination ability of various parts of the body. 5、Science experimenter materials, children's toy pendulum model, develop intelligence and improve thinking. 6 x Wooden Accessories 2 x Manual 2 x Glue 4 x Wood Beads 2 x Plastic Beads 2 x Rope 4 x Screw