Current location - Training Enrollment Network - Early education courses - The following tools ① balance, ② wrench, ③ tweezers, ④ claw hammer, ⑤ scissors, ⑤ bottle cap screwdriver, ⑦ chopsticks and ⑧ fishing rod are all simple machines.
The following tools ① balance, ② wrench, ③ tweezers, ④ claw hammer, ⑤ scissors, ⑤ bottle cap screwdriver, ⑦ chopsticks and ⑧ fishing rod are all simple machines.
When the balance is used, the power arm is equal to the resistance arm and is an equal arm lever;

During the use of wrenches, claw hammers and bottle cap screwdrivers, the power arm is larger than the resistance arm and is a labor-saving lever;

When using tweezers, scissors, chopsticks and fishing rods, the power arm is smaller than the resistance arm and is a laborious lever.

So the answers are: ②, ④, ⑥; ③、⑤、⑦、⑧; ①.

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