Home practical on water flow

PRACTICAL ON THE MOTION OF WATER SURFACE

The aim of the practical is to study the speed of the water surface
in the bottle.


1. Take a plastic bottle which is as cylindrical as possible. Fill the cylindrical part with water and place it standing next to the water sink.

2. Drill a tiny hole (diameter some mm’s) to the wall of the bottle.

3. Let the water flow from the hole and measure the height of the surface as a function of time. Do it as carefully as possible with repetitions. Use cylindrical part of the bottle.

4. Draw height as a function of time.

5. Use the graph to determine the average speed of the water surface over the time period it takes the bottle to empty.

6. Determine the instantaneous speed of the water surface at the time
instant half of the bottle is empty.

7. Make a report on the practical. Remember to
· introduce the instruments
· table the data (units)
· label the axes, title the graph etc.
· show your calculations
· remember hypothesis, conclusion and evaluation of the practical.

Deadline: By the last lesson before exam week.