Question

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2. (1) Try floating a sewing needle on water. In order for this activity to work, the needle needs to be very clean as even the ou
from your fingers can be suficient to allect the surlace properties of the needle. (2) Place the bristles of a paint brush into water.
Pull the brush out and notice that for a short while, the bristles will stick together. The surface tension of the water surrounding
the bristles is sufficient to hold the bristles together. As thc bristles dry out the surface tension cffect dissipatcs (3) Place a loop
of thread on the surface of still water in such u wuy that all of the thread is in contuct with the water. Note the shape of the loop.
Now place a drop of detergent into the middle of the loop. What huppens to the shupe of the loop? Why? (1) Sprinkle pepper
onto the surface of water. Add a drop of detergent. What bappens? Why? (5) Float two matches parallel to each other and add a
drop of detergent between them. What happens?​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

1. A metal needle or paper clip has higher density that that of water. So when it is dropped into water, it falls down into the bottom of water. However, if we put it horizontally on the water with a lot of caution, it can float almost forever due to the surface tension of water

2.