When we use a drinking straw, what unbalanced force pushes the liquid up the straw? Explain briefly with the help of a diagram. If there is a small hole in the upper part of the straw what difference does it make, if any?
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Solution
When we use a drinking straw, we suck the air present inside the straw.
Due to this, the pressure inside the straw decreases and the atmospheric pressure pushes the liquid up the straw.
So, the unbalanced force is the force exerted by the air.
If there is a small hole in the upper part of the straw, low pressure cannot be created in the straw even when we suck the air.
Hence, the straw won't work and we won't be able to drink the liquid.
