Select the situations from the list below in which mechanical energy is conserved. A ball sliding...

Select the situations from the list below in which mechanical energy is conserved.

A ball sliding down a hill with friction.

The Moon orbiting the Earth.

A ball sliding down a frictionless hill.

A child swinging on a frictionless swing, ignoring air resistance.

A ball that is dropped from a certain height and bounces back to a lower height.

An ice skater gliding along the ice.

Someone else posted this but the answer isn't correct.

Expert Solution

Mechanical energy is the sum of the potential and kinetic energies in a system. The principle of the conservation of mechanical energy states that the total mechanical energy in a system (i.e., the sum of the potential plus kinetic energies) remains constant as long as the only forces acting are conservative forces.
Friction is a non-conservative force. Therefore whenever Friction is present, Mechanical Energy is not conserved.

A ball sliding down a hill with friction - Mechanical Energy is not conserved.
The Moon orbiting the Earth - Mechanical Energy is conserved.
A ball sliding down a frictionless hill - Mechanical Energy is conserved.
A child swinging on a frictionless swing, ignoring air resistance - Mechanical Energy is conserved.
A ball that is dropped from a certain height and bounces back to a lower height - Mechanical Energy is not conserved.
An ice skater gliding along the ice - Mechanical Energy is conserved.

genius_generous answered 1 year ago

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