| Condition: | New |
|---|---|
| Customized: | Customized |
| Certification: | ISO9001 |
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lever balancer Demonstrator (Teaching instrument)
Product Introduction
The lever balancer instrument consists of base, bracket, lever, travel code, support pin and hook code.
Product Specification
| Product name | lever balancer |
| Material | plastic |
| Size | 540x90x245 mm |
Instructions
(1) Put the two sides of the lever into the corresponding positioning connection buckle to fix it, and then assemble the lever as shown in the figure for experimental exploration.
(2) Adjust the level of the lever, you can adjust the balance to make the lever balance, and then hang the hook at both ends of the lever. The left side of the lever is likened to the resistance point, the right side is the force point, and the support pin in the middle is the fulcrum.
(3) Hang a hook on the left side of the lever to record the position, and then hang a hook of the same size on the right side. If the lever is still in a balanced position, where should the position of the hook on the right hang? Through experiments, it can be found that the lever can be balanced only when the hanging position of the hook code on the right is the same as that of the hook code on the left. The experiment shows that the hook yards on the left and right sides are equal in distance, and the lever is balanced, indicating that the lever is neither labor-saving nor labor-intensive.
(4) Hang a hook at the number 10 on the left side of the lever, and hang two identical hooks at the number 5 on the right to find that the lever can also be balanced. Through experiments, it is found that two hooks are used on the force point on the right to balance the lever with one hook on the left, indicating that this lever is laborious.
(5) Hang two hooks at the number 10 on the left side of the lever and one hook at the number 20 on the right, and find that the lever can also be balanced. Through experiments, it was found that using a hook on the force point on the right can balance the lever with two hooks on the left, indicating that this lever is labor-saving.
(6) The distance from the force point to the fulcrum is greater than the distance from the resistance point to the fulcrum, and the lever saves effort.
The distance from the force point to the fulcrum is less than the distance from the resistance point to the fulcrum, and the lever is laborious.
The distance from the force point to the fulcrum is equal to the distance from the resistance point to the fulcrum, and the lever is effortless and effortless.
(7) Expansion in combination with textbooks: To balance the lever, the magnitude of the two forces (the force point, the fulcrum and the resistance point) acting on the lever are inversely proportional to their force arms. Power × power arm = resistance × resistance arm, expressed in algebraic formula as F1L1=F2 L2.
Product feature and application
For elementary school mathematics and science teaching experiments to understand the role of levers and the balance conditions of levers.
Maintenance and precautions
The instrument should be handled with care, and the lever should not be bent so as not to affect the experimental effect. After use, the components should be stored or placed in the experimental cabinet neatly. The hook should be placed in a dry and ventilated place to avoid rusting.
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