Activity
10.4
Take an empty plastic bottle. Close the
mouth of the bottle with ari airtight
stopper. Put it in a bucket filled with
water. You see that the bottle floats.
Push the bottle into the water. You feel
an upward push. Try to push it further
down. You will find it difficult to push
deeper and deeper. This indicates that
water exerts a force on the bottle in the
upward direction. The upward force
exerted by the water goes on increasing
as the bottle is pushed deeper till it is
completely immersed.
Now, release the bottle. It bounces
back to the surface.
Does the force due to the gravitational
attraction of the earth act on this
bottle? If so, why doesn't the bottle stay
immersed in water after it is released?
How can you immerse the bottle in
water?
Answers
Answered by
1
Explanation:
The gravitational pull on the empty plastic bottle is less than the upthrust force exerted on it by the water. In other words, its density is less than the density of water therefore it floats. On the other hand, a plastic bottle filled with sand sinks as the gravitational pull (weight) on it is more than the upthrust force of water.
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