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Authoritative PPT Summary
"Pressure" PPT courseware 5
1. Pressure
1. The force that presses vertically on the surface of an object is called pressure
The force of a child pressing vertically on the ground
The force of the thumbtack pressing vertically against the wall
The force exerted by the block vertically pressing on the incline
2. The relationship between pressure and gravity
1) Pressure is not gravity. Pressure can be caused by gravity or other forces
2) Pressure is not necessarily equal to gravity
3) The pressure is equal to the gravity only when the object is placed freely and horizontally
Experimental results
(1) When the stressed areas are the same, the larger the _______, the more obvious the effect of pressure;
(2) When the pressure is the same, the smaller the ___________, the more obvious the effect of the pressure;
Compare the magnitude of pressure
The pressure of object A on the ground is 10N, and the contact area with the ground is 5m2
The pressure of object B on the ground is 5N, and the contact area with the ground is 5m2
Small data:
A watermelon seed is placed flat on the table, and the pressure on the table is about 20Pa
When a newspaper is laid flat, the pressure on the table is about 0.5Pa
The pressure on the ground when an adult stands is about 1.5×104Pa
summary
1. Pressure: the force pressing vertically on the surface of an object
2. Pressure: (in physics, pressure is used to express the effect of pressure)
1. Definition of pressure: The pressure exerted on an object per unit area is called pressure.
2. Pressure formula:
3. Methods of increasing and decreasing pressure
1. Methods to increase pressure:
(1) When the stress area remains unchanged, increase the pressure;
(2) When the pressure remains unchanged, reduce the stress area.
2. Methods to reduce pressure:
(1) When the stress area remains unchanged, reduce the pressure;
(2) When the pressure remains unchanged, increasing the stress area reduces the pressure.
How much pressure do you exert on the ground?
Think about it:
How much pressure are you putting on the ground?
How do you estimate your contact area with the ground?
(The area of the small square in the picture is 1cm2)
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