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Force and Pressure
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07/05/2021 2:47 pm
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Take a good quality rubber sucker. It looks like a small rubber cup Fig. Press it hard on a smooth plane surface. Does it stick to the surface? Now try to pull it off the surface. Can you do it?
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07/05/2021 2:48 pm
When we press the sucker, most of the air between its cup and the surface escapes out. The sucker sticks to the surface because the pressure of the atmosphere acts on it. To pull the sucker off the surface, the applied force should be large enough to overcome the atmospheric pressure. Thus, this activity gives us an idea about the magnitude of atmospheric pressure.