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| Experimental components |
Lever scale, weights |
| Experimental process |
(1) Adjust the nuts on both ends of the lever so that the lever can reach a balanced state without weights, keeping it level and still. (2) Hang different numbers of weights on both ends of the lever, move the position of the weights to reach a balanced state on the horizontal position of the lever. At this time, the force on both ends of the lever is equal to the weight of their respective weights. (3) Take the weight of the weights on the left side of the fulcrum as the driving force F1, and the weight of the weights on the right side of the fulcrum as the resistance F2. Measure and record the driving arm L1 and resistance arm L2 when the lever reaches balance. (4) Change the values of force and force arm on both sides, repeat the above steps, and record relevant values. |
| Experimental phenomena | When the lever reaches a balanced state, the driving force multiplied by the driving arm is equal to the resistance multiplied by the resistance arm. The formula is F1.L1 = F2.L2. |
| Experimental conclusion | Through the condition of lever balance, it is known that in order to make the lever reach a balanced state, it must satisfy that the value of force multiplied by force arm on both sides is equal. If the balance of the lever is broken, then it will deflect towards whichever side has a larger value for force multiplied by force arm. |
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