why is it easier to stay afloat while using inflatable raft while swimming without one?
this is Science...
2007-04-16 08:30:24 · 5 answers · asked by hey 3 in Education & Reference ➔ Homework Help
You use no energy with a raft.
2007-04-16 08:39:49 · answer #1 · answered by Anonymous · 0⤊ 0⤋
With a raft you take up a larger volume of the water, but your weight is about the same. How something floats is related to the amount of water it displaces and its weight.
If the weight of the item floating is less than the weight of the water it displaces, then it floats. The closer the two are, the lower it floats.
Using a raft filled with air displaces more water, therefore it makes floating easier.
2007-04-16 15:50:45 · answer #2 · answered by Tiggy 1 · 0⤊ 0⤋
With a raft, you don't need to constantly stay in motion to stay afloat, while if you were just staying in one place in water, you would constantly have to use energy in order to keep you above water. if you just stayed still with no raft, you would drown.
2007-04-16 15:47:14 · answer #3 · answered by sportsgirl931 2 · 0⤊ 0⤋
That is due to a number of factors:
Buoyancy, for one. The inflatable raft, for instance, displaces across a greater proportion of water at a constant rate, as opposed to a person whom is sporadic in distribution of force.
The boat material causes less surface tension than your body, meaning that you have to apply energy and a certain amount of force to stay afloat.
The boat is filled with hydrogen, a gas that is lighter than water, so due to its density (which is less than one) it immediately floats to the top (which is why it never stays under water long when you hold it under ^.^). As opposed to your body, which is composed of material denser than the water, you are prone to float. Which is why propulsion is required for us to float (kicking your hands and feet).
2007-04-16 15:51:43 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Have you tried floaties on your arms?
2007-04-16 16:02:05 · answer #5 · answered by jon_mac_usa_007 7 · 0⤊ 0⤋