Choose between the options: Energy is constant or Energy is not constant For the

Question

Choose between the options: Energy is constant or Energy is not constant

For the following situations, determine whether or not energy is constant for the process indicated for the different systems. Opts Opts A mass is hung from a spring that is vertical. The mass is made to oscillate vertically. Call the initial time when the mass is at its highest position and the final time when the mass is at its equilibrium position. System: mass System: mass + Earth System: mass + spring + Earth A mass on a table is attached to spring that is horizontal. You give the mass a brief push so that the mass travels horizontally. Call the initial time when the spring first reaches its maximum stretch in the initial direction of motion. The final time is when the spring first reaches its zero stretch length. System: mass System: table System: mass + spring + table System: mass + table System: mass + spring

Explanation / Answer

1.

Mass: No constant

Because, the mass is in contact with the spring, there is an external force, so the energy doesn't remain constant.

Mass+Earth: No constant

Same as above

Mass+spring+Earth: Constant

In this case all energy reamins constant.

2.

Mass: No constant

Table: Constant

Mass+spring+table: Constant

Mass+table: No constant

Mass +spring: No constant

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