[Experimental report on lever ruler research] Experimental report on lever research

Experimental report on lever ruler research

Team Name: Team Leader: Members:

Experimental content 1. Build a lever ruler.

Second, study which levers are labor-saving, which levers are laborious, and which levers are neither labor-saving nor laborious. Third, find a balance.

Structure diagram of lever ruler

Remarks: ④ ⑤ Nut ⑤ Base experimental instrument lever ruler (one set) and hook code (one set)

Experimental steps and precautions 1. Build a lever ruler.

Steps: according to the given materials, build a lever ruler according to the instructions. Several knowledge points of lever ruler;

1, lever ruler _ _ _ _ _ _ _ (yes or no) lever.

2, the fulcrum in _ _ _ _ _ (optional? 、? 、? , ④, ⑤)

3, before the experiment to adjust the balance, adjust the balance is to use _ _ _ _ _. If the left side of the lever ruler is inclined, then the nut should be moved to _ _ _ _ _ _ _ (left or right). If the right side of the lever ruler is inclined, then the nut should be moved to _ _ _ _ _ _ _ (left or right).

4. We selected _ _ _ _ _ _ _ (left or right). 5. Our group selected _ _ _ _ _ _ _ (left or right).

Second, study which levers are labor-saving, which levers are laborious and which levers are neither labor-saving nor labor-saving. Steps: Use the same number of hook codes to hang on the stress point and resistance point respectively. Observe the balance of the lever ruler (which side is inclined). Matters:

1. If the experimental phenomenon is that the left side inclines upward, then the lever belongs to _ _ _ _ _ _ _ _ _ (labor-saving, labor-saving or neither labor nor labor-saving).

2. If the experimental phenomenon is that the right side inclines, then the lever belongs to _ _ _ _ _ _ _ _ (labor-saving, laborious or neither laborious nor laborious).

3. If the experimental phenomenon shows that the lever ruler is balanced (both sides are not inclined), then the lever belongs to _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

The number of hook codes on both sides of the fulcrum must be consistent.

5. Because the first holes at both ends of the fulcrum of the lever ruler are too close to the pillar of the lever ruler, we don't use the first hole. Third, find a balance.

* This experiment is an additional experiment, and everyone can play it freely.

Experimental data recording and statistics

Statistics:

There are _ _ _ kinds of labor-saving situations; There are _ _ _ _ kinds of tension; There are _ _ _ _ kinds of situations that are neither labor-saving nor laborious. Rule discovery:

1, under what circumstances does the lever save effort?

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

_________________________________________________________________________

Find the balance experimental data record table.

Rule discovery:

Under what circumstances will the lever ruler be balanced?

_________________________________________________________________________