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- Physics (PH)
A wooden block is pressed in water then. 1. its potential energy increases. 2. its potential energy decreases. 3. its potential energy does not change. 4. cant
A wooden block is pressed in water then. 1. Its Potential Energy increases. 2. Its Potential Energy decreases. 3. Its Potential Energy does not change. 4. Cant say. Explain how2
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Lekhika
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kindly see attached file for solution.
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Sahil nath
1)It's Potential Energy increases.... Since buoyant force is a conservative force, work done against it is stored as potential energy(gained). Hence, the potential energy of the block increases as, by pressing the block into water, work is done against the buoyant force. Any force acting on an object which is independent of the path traversed by the object is generally termed as conservative force, such as gravitational force, spring force. As buoyant force acts directly opposite to gravitational force and wheresoever you move the object at a certain depth, the work done against buoyant force remains the same. A simpler approach towards the question would be what happens when you release the object after pressing it to a certain depth, it springs up, i.e. it gains Kinetic Energy. Now where does that Kinetic Energy come from, obviously this gain in Kinetic Energy is a direct result of the loss of Potential Energy, which implies that while pressing the block, Potential Energy of the block must have increased.
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but how does we determine force type.
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Deepak
Due to conservative force, it stores in its potential energy. As this force stores so that the body tries to reach its equilibrium position, such force is a conservative force like gravitational, spring, and here buoyancy. if force store it must be conservative other force loss in energy.