Physics experiment questions for junior 2 and physics experiment questions for junior 2

Ha actually rushed to answer!! But luckily, it was written wrong

F float = g row g row ah!

g row does not = v2-v1 does not = f float that is the volume.

And = (v2-v1) multiplies the density of water by g = f float.

Block density expression: (v2 v1) times 1000 v3 v1

In addition, you can use a thin wire and a small iron strip instead of a thin needle to immerse the wax block in the graduated cylinder, the content is very similar but more complicated!

Don't rush to answer the above next time, I haven't seen the questioner yet, can I use the balance! It would have been easier to use a scale

Selected experimental equipment: irregularly shaped wax blocks, graduated cylinders, fine needles, sufficient amount of water.

Whole process: Experimental procedure: Put some water in the graduated cylinder first, write down the scale v1 at this time, then put the wax block into the graduated cylinder, and note that the scale at this time is v2 after stationing

Then the mass of the wax block = (v2-v1) by the density of water = f float g

Then use a fine needle to immerse the wax block in the graduated cylinder, and write down the scale V3 at this time, and the volume of the wax block is V3 V1

Block density expression: (v2 v1) times 1000 v3 v1

Selected experimental equipment: irregularly shaped wax blocks, graduated cylinders, fine needles, sufficient amount of water.

Experimental procedure: Put some water in the graduated cylinder first, write down the scale v1 at this time, and then put the wax block into the graduated cylinder, and note that the scale at this time is v2 after stationing

Then the mass of the wax block is V2 V1 (F floating G row).

Then use a fine needle to immerse the wax block in the graduated cylinder, and write down the scale V3 at this time, and the volume of the wax block is V3 V1

Block density expression: v2 v1 v3 v1

The density of the wax block is generally cubic centimeters).

6 hooks of the same quality; 1 scale.

Stand the scale upright on the right side of the pulley block unit.

Hang 1 hook code under the movable pulley in turn, pull the rope end with a spring dynamometer, pull up vertically and slowly and at a constant speed to rise a distance, record the rope end moving distance S and the hook code moving distance H respectively, and record the quality m of the hook code and the indicator F of the spring dynamometer in **.

Hang 2, 3, 4, 5, 6 hook codes sequentially under the movable pulley, repeat the steps and record the total mass m of the hooked code each time and the indication f of the spring dynamometer in ** respectively.

Using the formula =w has w total = mghfs to calculate the hook code of six lifts of different weights, the mechanical efficiency of the pulley block is 1, 2, 3....6, and record the data in **

Same pulley set, hook code, spring dynamometer.

First, the gravity of a hook code is measured with a dynamometer, the hook code is hung on the pulley block, and the tensile force is measured by pulling the pulley block in a straight line at a uniform speed with a dynamometer to calculate the mechanical efficiency;

Then use the dynamometer to measure the gravity of the two hook codes, hang the hook code on the pulley block and pull the pulley block with the dynamometer at a uniform speed to measure the tensile force, and calculate the mechanical efficiency; to compare.

Design experiment: equipment: fish tank (with water, fish), newspaper.

Steps: Wrap the newspaper around the fish tank, pat the table and observe the fish's reaction.

Phenomenon: When the table is slapped, the fish swims around.

Conclusion: Liquids can transmit sound

Hehe, that's the standard answer, I've done it.

If there is anything you don't understand in the future, you can come and ask me oh o( o

As long as the water can vibrate, it can make sound. Put a motor in the water, close the cover, turn on the motor and listen to the sound.

Also, use a drop of water from a high place to drop into a tank filled with water and hear a sound.