Unit 8 · Floatation

Upthrust

ScienceSubject

8 minEstimated read

Activity 8.4

Observation of Upthrust

Method

Take an empty plastic bottle and some water in a bucket.
Tighten the cap of the bottle to make it airtight.
Drop the bottle into the bucket. The bottle floats on the water.
Push the bottle into the water.
Observe, discuss and answer the questions below.

Discussion

When the bottle is pushed into the water, do you feel that the bottle is being pushed upwards?
When the plastic bottle is let go in the air it falls because of gravity, but why doesn't it sink when it is placed on the surface of the water?
Doesn't gravity act on the bottle when it is placed in water?

🔐

That's a peek at activity 1 of 2 - sign in for all of them, full length.

Create free account Sign in