Do this experiment in groups of four friends. Each group will need a big pot filled with water and the things listed in the table. Put each thing one-by-one in water and observe.
Mark [√] for the things that float. Mark [×] for those that sink.
Things to be put in water
I guessed, before I did it
I saw, when I did it
(a) Empty bowl (katori)
(b) After putting in 6-7 small pebbles, one-by-one
Iron nail or pin
Matchstick
(a) Empty plastic bottle with its lid closed
(b) Bottle half-filled with water
(c) Bottle full of water
Aluminium foil (from medicine packing)
(a) Open and spread out
(b) Pressed tightly into a ball
(c) In a cup-like shape
(a) Soap cake
(b) Soap cake on a small plastic plate
A piece of ice
Find out from the other groups which things floated and which sank in the water?
After doing the experiment, fill in the blanks.
- The iron nail ________ in water but the katori ________. I think this happened because _______________________________________________________________________________.
- The empty plastic bottle _________ on water. The bottle filled with water _________ because ____________________________________________________________________________.
- The aluminium foil _________ when it was spread out. When pressed tightly into a ball it _________. This may have happened because_________________________________________________________________.
Do this experiment in groups of four friends. Each group will need a big pot filled with water and the things listed in the table. Put each thing one-by-one in water and observe.
Mark [√] for the things that float. Mark [×] for those that sink.
| Things to be put in water | I guessed, before I did it | I saw, when I did it |
|
(a) Empty bowl (katori) (b) After putting in 6-7 small pebbles, one-by-one |
||
| Iron nail or pin | ||
| Matchstick | ||
|
(a) Empty plastic bottle with its lid closed (b) Bottle half-filled with water (c) Bottle full of water |
||
|
Aluminium foil (from medicine packing) (a) Open and spread out (b) Pressed tightly into a ball (c) In a cup-like shape |
||
|
(a) Soap cake (b) Soap cake on a small plastic plate |
||
| A piece of ice |
Find out from the other groups which things floated and which sank in the water?
After doing the experiment, fill in the blanks.
- The iron nail ________ in water but the katori ________. I think this happened because _______________________________________________________________________________.
- The empty plastic bottle _________ on water. The bottle filled with water _________ because ____________________________________________________________________________.
- The aluminium foil _________ when it was spread out. When pressed tightly into a ball it _________. This may have happened because_________________________________________________________________.
- The iron nail sank in water but the katori floated. I think this happened because
(i) the weight of water displaced by the iron nail is less than its own weight
(ii) the weight of water displaced by the katori is equal to its own weight.
- The empty plastic bottle floats on water. The bottle filled with water sinks because
(i) the weight of water displaced by the empty plastic bottle is equal to its own weight.
(ii) the weight of water displaced by the bottle filled with water is less than its own weight
- The aluminium foil floated when it was spread out. When pressed tightly into a ball it sank. This may have happened because
(i) the weight of water displaced by the aluminium foil is equal to its own weight .
(ii) the weight of water displaced by the aluminium ball is less than its own weight
- The iron nail sank in water but the katori floated. I think this happened because
(i) the weight of water displaced by the iron nail is less than its own weight
(ii) the weight of water displaced by the katori is equal to its own weight.
- The empty plastic bottle floats on water. The bottle filled with water sinks because
(i) the weight of water displaced by the empty plastic bottle is equal to its own weight.
(ii) the weight of water displaced by the bottle filled with water is less than its own weight
- The aluminium foil floated when it was spread out. When pressed tightly into a ball it sank. This may have happened because
(i) the weight of water displaced by the aluminium foil is equal to its own weight .
(ii) the weight of water displaced by the aluminium ball is less than its own weight
