The friction reduces due to the water logged near and below the boulder. Also, due to the upthrust by the water, there is an apparent loss in the weight of the boulder. Therefore boulders can move easily by the flood.
An iron nail floats on mercury because the density of mercury is greater than the density of iron. But the density of water is less than that of iron so it sinks in water. Because the density of mercury is more than the density of water. An object floats in a liquid if its density is lower than that of the liquid.
a) Big boulders can be moved easily by floods because the force of the rushing water is very strong. When there's a flood, the water pushes against the boulders with a lot of power, and this force can lift and carry the heavy rocks, making them move along with the flow of the water. It's like a very strong push from the water that can overcome the weight and resistance of the boulders, allowing them to be transported by the flood.
b) The reason an iron nail sinks in water but floats in mercury is due to the differences in their densities. Water has a lower density than iron, so the iron nail sinks in it. On the other hand, mercury is much denser than iron, causing the iron nail to float when placed in mercury.
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a) Big boulders can be moved easily by floods because the force of the rushing water is very strong. When there's a flood, the water pushes against the boulders with a lot of power, and this force can lift and carry the heavy rocks, making them move along with the flow of the water. It's like a very strong push from the water that can overcome the weight and resistance of the boulders, allowing them to be transported by the flood.
b) The reason an iron nail sinks in water but floats in mercury is due to the differences in their densities. Water has a lower density than iron, so the iron nail sinks in it. On the other hand, mercury is much denser than iron, causing the iron nail to float when placed in mercury.
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