Long answer type questions
1. Describe an activity to show that the pressure produced increases when the surface area is
decreased, for the same force applied.
2. Briefly outline an activity to demonstrate the presence of atmospheric pressure.
Draw a simple diagram and explain the working of an open-tube manometer.
Answers
Answer:
1. when u use a blunt nail and make it go into a pice of wood it won't go but if u r using a pointed nail , less forse will be needed and less time will also be consumed it will make hole into the log very easily. when area is lesson the pressure increases and within less force u can insert the nail easily
2.To show the presence of atmospheric pressure, you need a glass tumbler, a stiff cardboard and water. Take the tumbler and fill it with water such that it is full till the brim. Cover it with a cardboard piece. Then place your hand over the cardboard piece on the tumbler and quickly invert it. Now, slowly, remove your hand while supporting the cardboard piece. It is observed that the cardboard piece does not fall. This proves that there is atmospheric pressure that provides enough force to support the weight of the water in the tumbler.
Open tube manometer is a type of simple pressure gauge, an instrument that measures pressure. A manometer is made up of a U-shaped tube containing liquid or sometimes water. One arm of the U-shaped tube is open to the air while the other arm is connected to the vessel in which pressure is being measured. The difference in liquid levels shows the applied pressure.
Answer:
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