Questions: Considering only the initial and final situations, identify which mechanical energies have changed. In addition, determine whether you will need to consider any work done by external forces or changes in thermal energy. Check all that apply. Kinetic energy has changed. Gravitational potential energy has changed. Spring potential energy has changed. Work by external forces on the system must be considered. Thermal energy of the system has changed. Submit Request Answer

Considering only the initial and final situations, identify which mechanical energies have changed. In addition, determine whether you will need to consider any work done by external forces or changes in thermal energy.
Check all that apply.
Kinetic energy has changed.
Gravitational potential energy has changed.
Spring potential energy has changed.
Work by external forces on the system must be considered.
Thermal energy of the system has changed.
Submit
Request Answer

Transcript text: Considering only the initial and final situations, identify which mechanical energies have changed. In addition, determine whether you will need to consider any work done by external forces or changes in thermal energy. Check all that apply. Kinetic energy has changed. Gravitational potential energy has changed. Spring potential energy has changed. Work by external forces on the system must be considered. Thermal energy of the system has changed. Submit Request Answer

Solution

Solution Steps

Step 1: Analyze the Changes in Mechanical Energies

To determine which mechanical energies have changed, we need to consider the types of energy involved in the system. The main types of mechanical energy are kinetic energy, gravitational potential energy, and spring potential energy.

Kinetic Energy: This energy changes if there is a change in the velocity of the object(s) involved.
Gravitational Potential Energy: This energy changes if there is a change in the height of the object(s) relative to a reference point.
Spring Potential Energy: This energy changes if there is a change in the compression or extension of a spring.

Step 2: Consider Work by External Forces

Work by external forces must be considered if there are forces acting on the system from outside that do not conserve mechanical energy. This could include applied forces, friction, or air resistance.

Step 3: Consider Changes in Thermal Energy

Thermal energy changes if there is energy dissipation due to non-conservative forces like friction, which converts mechanical energy into heat.

Final Answer

Kinetic energy has changed.
Gravitational potential energy has changed.
Spring potential energy has changed.
Work by external forces on the system must be considered.
Thermal energy of the system has changed.

\[ \boxed{ \begin{align_} \text{Kinetic energy has changed.} \\ \text{Gravitational potential energy has changed.} \\ \text{Spring potential energy has changed.} \\ \text{Work by external forces on the system must be considered.} \\ \text{Thermal energy of the system has changed.} \end{align_} } \]

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