"Pressure" PPT courseware 2

Description

"Pressure" PPT courseware 2

teaching objectives

1. Knowledge and skills

Understand the concept of pressure.

Understand the factors that determine pressure.

Simple calculations can be made using the pressure formula.

Understand the main methods of increasing and decreasing pressure.

2. Process and methods

Observing various pressure-related phenomena in life and understanding comparisons are the basic methods to improve physical thinking.

What factors are related to exploring the effects of stress? After going through the main part of exploration, through exploring experiments, observing experimental phenomena and collecting experimental data, you can gain a deeper understanding of pressure and initially learn to use the control variable method.

Practice how to change the pressure through hands-on practice.

What factors are related to the effects of stress?

Because the effect of stress may be related to multiple factors, the control variable method should be used during the exploration process.

Conjecture 1: The effect of stress may be related to _____________?

Conjecture 2: The effect of stress may be related to _____________?

Experimental results:

(1) When the stressed areas are the same, the larger _____, the more obvious the effect of pressure;

(2) When the pressure is the same, the smaller __________, the more obvious the effect of pressure.

Summary

1. Pressure: The force acting vertically on the surface of an object.

2. Pressure (indicating the effect of pressure)

Consolidation exercises

1. Students come up with a method: first measure the area of ​​the shoe sole, so that students can clearly understand that the purpose of this measurement is to measure the force-bearing area and obtain the measurement method of the contact area of ​​general irregular objects.

2. After using saws, scissors, axes, etc. for a period of time, the cutting edges will become dull (that is, the contact area will become larger), making them more laborious to use. After sharpening, the blade will become sharper (that is, the contact area will become smaller), making it easier to use.

3. The weight of a camel is less than twice that of a horse, and the area of ​​its paw is three times that of a horse's hoof. What favorable conditions does this provide for the "Desert Ship"?

Answer: The camel's soles are very large, and the pressure on the desert is relatively small, so it is not easy to fall into the desert.

4. When a tank crosses a trench, there is a simple way: the tank is equipped with an air bag. When it encounters a trench, put the air bag down. After inflating the air bag, the tank will pass through the trench as if it were walking on flat ground. Assume the mass of the tank is 4×104 kg and the track area is 5m2. When the front half of the track of the tank presses on the air bag, how much pressure does the tank exert on the air bag? (Assume that the front and rear of the tank are symmetrical) Answer: 8×104Pa

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Update Time: 2024-11-22

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

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