why do you seem to weigh less in water
Based on the general definition of weight, which is defined in physics by the formula: Weight=Mass times Force of acceleration due to gravity, objects do not weigh less in water. They actually are the same weight as they are on dry land due to gravity acting at a constant acceleration on the mass of the object. Objects due however "appear" to weigh less in water. This is due to what is known as buoyancy. Buoyancy is actually the upward force of a liquid acting on an object that is placed in it. This force, known as buoyant force has been shown to be equal to the weight of water the object displaces. This is known as.
This principle allows one to calculate the "apparent mass" of an object under water, provided one knows the density of water and the volume, and mass, of the object. Interestingly, this concept only applies to the volume of an object, which creates the upwards pressure, rather than the objects actual mass. For example, a square box made of plastic would displace as much water as an equally sized square box made of lead, meaning the buoyant force generated by both objects would be identical, despite the buoyant force appearing to have a greater effect on the less massive object. P
Hope this helps! That s because of the buoyant force!
Think of it like this, if your friend tries to pick you up, he s putting a force on you up, right? At the same time, gravity is pulling you down. Your friend has to pull harder than gravity to win and lift you off the ground. Now let s put you in water instead. Gravity is still pulling on you, just as strong. But now there are two forces pulling you up. One is your friend, and the other is the water below you. Think of it like this: if you start to sink into a pool, your body is pushing water out of the way, and your body is moving into that water s place. Well that water is pushing back against you, pushing you up, so that it doesn t have to move out of your way, and we call that force the buoyant force.
So now your friend doesn t have to beat gravity alone, his strength plus the buoyant force have to beat gravity. Since the buoyant force is taking part of the load, you feel much lighter. EDIT: This is also why you will sink if you stand vertically in water, but you ll float if you lay on your back. On your back, there s more water beneath your body s area, and it s all pushing up with that buoyant force. Straight up and down, it s just the water right below your feet pushing back, so you ll sink.
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