Is Mechanical Energy Conserved? Select all the correct statements about the mech

Question

Is Mechanical Energy Conserved? Select all the correct statements about the mechanical energy of the cases below (select all that are true). Situations for energy conservation Case (): Two blocks are hanging from two ropes. One block is pulled back and let go, hitting another block. After the hit, the second block is raised to a height slightly lower than the first block's initial height Case (1) : A block hangs vertically from an ideal spring, bouncing up and down. Case (I): A bucket of water is tied to the tip of a string and swung around in a vertical circle. Case (IV): A stunt car flies over a cliff with initial speed vo (assuming the road is frictionless) Pick all of the correct answers u In Case III, the ME of the bucket and the water is not conserved because the force acting on the rope is non-conservative. None of the statements are correct ? Let me look at the instructions. In Case I, the ME of the system consisting of the two blocks is not conserved because some energy is lost during the collision process u In case ll the ME of the system consisting of the spring and the block is not conserved because gravity is acting in the same direction as the spring. The case IV, the ME of the system is conserved because no non- conservative forces do work on the car a

Explanation / Answer

Option 4 and 6 are correct.

In case 1 ME is not conserved because during collision some of energy will be lost in deformation, sound energy, heat etc

In case 4 ME is consevved because there isn't any non conservative force is present in this case

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