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"Pressure" PPT download
Part One: Review
1. What is pressure? What factors are related to the effects of stress?
A force acting perpendicularly to the surface of an object. Factors that affect its effect include: the size of the pressure and the size of the force-bearing area.
2. What is pressure?
Pressure is a physical quantity that quantitatively expresses _________. Its calculation formula is _________.
The meaning of 2×103 Pa is _________.
The pressure on an object per square meter of force area is 2×103 N.
3. Among the following statements about pressure, which one is correct ( )
A. The greater the pressure, the greater the pressure
B. The larger the stressed area, the smaller the pressure.
C. The greater the pressure per unit area, the greater the pressure.
D. The greater the gravity, the greater the pressure it generates
4. Three solid cylinders made of the same material have the same height. The masses of A, B, and C are 2 kg, 4 kg, and 8 kg respectively. If they are placed vertically on the horizontal ground, the pressure on the ground will be ( )
A. A is the biggest B. B is the biggest
C. C is the largest. D. All three are the same size.
Pressure PPT, Part 2 Content: Discussion:
1. What methods can be used to increase pressure? for example.
Answer: Increase the pressure and reduce the stress area.
2. What methods can be used to reduce pressure? for example.
Answer: Reduce the stress area and increase the pressure.
Observe and think
How can a tiny cicada insert its thin mouthparts into the thick bark of a tree?
Why is it easier to cut an orange with a sharp knife?
The blade is sharp, which reduces the force-bearing area. When the pressure is constant, the pressure on the orange can be increased, making it easier to cut the orange.
Pressure PPT, Part 3: Methods of increasing and decreasing pressure
1. Methods to increase pressure
1) The pressure remains unchanged and the stress area is reduced.
2) The force-bearing area remains unchanged and the pressure increases.
3) Increase the pressure and reduce the stress area
2. Methods to reduce pressure
1) The pressure remains unchanged and the stress area is increased.
2) The force-bearing area remains unchanged and the pressure is reduced.
3) Reduce pressure and increase stress area
Pressure PPT, Part 4: Practice
1. As shown in the figure, the density of a block is 5g/cm3, the length is 10cm, the width is 4cm, and the height is 5cm. What is the pressure of the block on the ground as shown in Figure 1?
2. If it is cut off in the middle, what is the pressure of each piece on the ground?
3. If it is placed on the horizontal ground as shown in Figure 2 on the right, what is its pressure on the ground?
4. When the bricks are placed flat, sideways or vertically on the ground, as shown in the figure, the pressure of the bricks on the ground is equal. When the bricks are _____, they have the greatest pressure on the ground. When the bricks are _____, they have the greatest pressure on the ground. The pressure is minimal.
5. In daily life, people who sit on sofas and wooden chairs for long periods of time do not feel pain easily because of ____. Can you tell the scientific reason why?
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