A ball is moving with a constant velocity. After some time, it collides with a wall. Which one of the following remains conserved except momentum?*1 pointEnergyDisplacementPowerForce
Question
A ball is moving with a constant velocity. After some time, it collides with a wall. Which one of the following remains conserved except momentum?*1 pointEnergyDisplacementPowerForce
Solution
The correct answer is Energy.
Here's why:
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Momentum: In an isolated system (like a ball colliding with a wall), momentum is conserved. This is a fundamental principle of physics known as the law of conservation of momentum.
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Energy: The total energy of an isolated system is also conserved. This is known as the law of conservation of energy. In the case of the ball, its kinetic energy before the collision is converted into other forms of energy (like sound, heat, and deformation energy) after the collision.
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Displacement: Displacement is not conserved in this scenario. Displacement refers to the change in position of an object. When the ball hits the wall, its displacement changes.
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Power: Power, which is the rate of doing work or transferring energy, is not conserved. The power exerted by the ball changes when it hits the wall.
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Force: Force is also not conserved. The force exerted by the ball on the wall and the force exerted by the wall on the ball (according to Newton's third law) are equal and opposite, but this doesn't mean that force is conserved. The forces change when the ball hits the wall.
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