"Using buoyancy knowledge to measure the density of matter" Buoyancy PPT

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"Using buoyancy knowledge to measure the density of matter" Buoyancy PPT

►Type 1: Measuring the density of a substance by weighing

1. In order to measure the density of a small piece of ore, Xiaoli used a spring dynamometer, water and a thin wire to conduct the following experiment:

(1) Hang the small ore under the spring dynamometer (as shown in Figure 5-ZT-1A). When the small ore ______, read the dynamometer to read 4.9 N.

(2) Put the small ore ______ in the water and read the indication F of the spring force gauge (as shown in Figure B), then F = ____N.

(3) The buoyancy force on small ores is F float = ____N.

(4) The density of small ore is ρ=______g/cm3.

2. Xiao Ming measured the density of salt water using a spring dynamometer, a cylinder, and several identical beakers (containing a certain amount of water and salt water respectively). The display of the device and spring dynamometer is shown in Figure 5-ZT-2. . (g is taken as 10 N/kg)

(1) From Figures A and B, it can be seen that the buoyancy force experienced by the cylinder when immersed in water is ____N, and the volume of the cylinder is ________m3.

(2) Using the experimental data shown in the figure, the density of salt water is calculated as ρ salt water = ________kg/m3.

►Type 2: Floatation and suspension method to measure the density of substances

3． Student Xiaohong needs to use a scale, a cylindrical glass tube and an appropriate amount of water to measure the density of copper sulfate solution. The following are the experimental steps designed by Xiaohong. Please follow her experimental ideas and complete the experimental steps.

(1) She found a uniform thin strip of wood, wound several turns of wire around one end of the thin strip, measured the length of the thin strip as L with a scale, and recorded it in the table.

(2) Place the thin wooden strip in the water and float vertically. Use a scale to measure the length of the part of the thin wooden strip above the water surface as L1, and record it in the table.

(3)______________________________________________________________ and record in the form.

(4) It is known that the density of water is ρ water. Use the measured physical quantity and ρ water to calculate the density of the copper sulfate solution ρ = ____________, and record the calculation results in the table.

4. The following is the experimental process and analysis of Zhang Chao's method of measuring the density of plasticine using a measuring cylinder and water. Figure 5-ZT-3 shows the operation scenario of the entire experiment. Please fill in the blanks below.

(1) Put an appropriate amount of water in the measuring cylinder, and read the scale value V1 = _______ corresponding to the water surface.

(2) Shape the plasticine into a bowl shape, carefully put it into the measuring cylinder and make it float on the water. Read the scale value V2 corresponding to the water surface at this time. According to the floating conditions, the mass of the plasticine can be found: m = ________. (g is taken as 10 N/kg)

(3) Then put the plasticine into a ball and put it into the measuring cylinder to let it sink to the bottom of the water. Read the scale value V3 corresponding to the water surface at this time.

(4) Using the density calculation formula, the density of plasticine can be calculated as ________kg/m3.

5. There is an irregular-shaped wood block. Xiao Ming measured the density of the wood block using the method shown in Figure 5-ZT-4 A, B, and C. The experimental steps are as follows:

(1) Pour an appropriate amount of water into the container, and the volume of water is recorded as V1.

(2) Gently put the wood block into the container and the liquid level rises to V2.

(3) Press the wood block with a fine needle to ______________ and the liquid level rises to V3.

(4) Based on the experimental data, the density of the wood block can be calculated as ρ = ________. (expressed in physical quantity symbols)

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For more information about the "Buoyancy: Measuring the density of matter using buoyancy knowledge" PPT courseware, please click on the Buoyancy ppt: Measuring the density of matter using buoyancy knowledge ppt tag.

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Update Time: 2024-07-31

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 2 industry PPT template

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