| 摘要 |
PROBLEM TO BE SOLVED: To provide a resultant force experimenting disk enabling easy comprehension of balance of forces in dynamics at a class of science or physics in a school. SOLUTION: Three weights each of equal weight are put on a disk in such a way as to make the disk in a state of balance. By checking the position of each weight then, the balance of three forces (composition of two forces) is comprehended.
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