People's Education Edition Physics for Grade 8, Volume 2

Description

"Archimedes' Principle" Buoyancy PPT

Part One: Learning Objective Navigation

learning target

1. Understand Archimedes’ principle.

2. Be able to use Archimedes’ principle to calculate the buoyancy force on an object

Learning points

1. Explore what factors are related to the size of buoyancy.

2. Be able to use Archimedes' principle to calculate the buoyancy force on an object.

Knowledge link: Calculation of buoyancy, gravity and density using weighing method

Archimedes Principle PPT, part 2: independent preview before class

(Read textbook P53~P56, think about the following questions, draw relevant key contents in the textbook, and mark questions)

1. What did Archimedes think of when he measured the volume of the crown?

2. What is the content of Archimedes' principle? What physical quantities need to be measured during the research process?

Archimedes Principle PPT, Part 3: Classroom Cooperation and Exploration

1. Explore the relationship between the buoyancy force on an object and the gravity that displaces liquid.

1. Demonstration experiment: Conduct the experiment according to Figure 10.2-2 on P54 of the textbook.

Warm reminder: Use thin wire to tie the stones securely. The stones are immersed in the overflow cup. Do not let the stones touch the bottom or wall of the cup.

2. Data sorting: Fill in the measured experimental data in the table below, and write the experimental conclusion:

Discussion 1: The buoyant force on an object immersed in a liquid is equal to ______________.

Expressed as F float = _____ = _____ = _____ . The volume of the displaced liquid is equal to the volume of the object immersed in the liquid.

Discussion 2: If during step B of the experiment, the stone hits the bottom of the container and generates pressure on the bottom, the measured buoyancy will be biased toward _____.

Tip 1: (1) When the object is completely immersed (immersed) in the liquid, V row = V object; when the object is partially immersed in the liquid, V row < V object.

(2) It can be seen from the formula that the buoyancy force of a liquid on an object is related to __________ and __________, and has nothing to do with the volume, gravity, shape, immersion depth, etc. of the object.

2. Application of Archimedes’ Principle

Read the example questions on P55 of the textbook.

[Example 1] A solid iron ball with a volume of 100 cm3 is immersed in water. The buoyancy force on the iron ball is _____N, and the direction of the buoyancy force is _____.

[Example 2] Regarding the buoyancy force experienced by an object in a liquid, which of the following statements is correct ()

A. A floating object experiences a greater buoyant force than an object sinking to the bottom

B. The greater the density of an object, the smaller the buoyant force it experiences

C. The greater the volume of water an object displaces, the greater the buoyant force it experiences.

D. The buoyant force on an object submerged in water depends on the depth

[Example 3] As shown in the figure, lead balls, iron plates and aluminum blocks of equal volume and different shapes are immersed in water at different depths, then ()

A. The buoyancy force on the iron plate is large

B. The aluminum block is subject to a large buoyancy force

C. The shot put has a large buoyant force

D. They experience the same buoyant force

[Example 4] In an experiment to explore "what factors are related to the size of buoyancy?" Chenchen and his partners conducted a series of experiments as shown in the figure below.

(1)①②③The three experiments are to explore the relationship between the size of buoyancy and _________, and the conclusion is ____________________.

(2) Analyzing the experimental data of _____ three times, it can be seen that the buoyancy force has nothing to do with the depth of the object immersed in the liquid.

(3) This experiment also explored the relationship between the size of the buoyancy force and __________, and concluded that ____________________.

(4) It can be seen from experimental data that the density of the metal block is _____kg/m3.

(5) The density of salt water can also be calculated using the results of three experiments _____, _____ and _____.

Archimedes Principle PPT, Part 4: Homework

1. An object weighing 80 N is placed in an overflow cup filled with water. If 30 N of water overflows from the cup, the buoyant force on the object is ()

A. 80 N B. 30N

C. 50N D． 110N

2. Hang two objects under a spring dynamometer respectively. When they are immersed in water at the same time, if the decrease value of the two spring dynamometers is the same, then the two objects must have the same ()

A. Density b. volume

C. Quality D. weight

3． Which of the following statements about buoyancy is correct ()

A. As long as the density of the liquid is high, the buoyancy force on the object immersed in it must be high.

B. As long as the volume of an object is large, the buoyancy force it experiences must be large

C. The buoyancy force on an object is equal to the gravity of the liquid displaced by the object, and has nothing to do with the shape of the object and the depth of immersion in the liquid.

D. Archimedes' principle only applies to liquids

4. As shown in the figure, A, B, and C are aluminum blocks, iron blocks, and copper blocks with the same volume and different shapes respectively. When they are immersed in water (none of them are tightly attached to the bottom of the container), regarding the buoyancy force they receive, Which of the following statements is correct ()

A. A is the largest

B. B is the largest

C. C is the largest

D. same size

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Update Time: 2024-11-05

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