Understanding Mechanical Energy and Conservation

What is total mechanical energy composed of?

• The sum of kinetic and potential energy

• Only potential energy

• Only kinetic energy

• The difference between kinetic and potential energy

In a conservative system, what happens to the total mechanical energy?

• It fluctuates randomly

• It remains constant

• It decreases over time

• It increases over time

What is a key characteristic of a conservative system?

• Constant temperature

• Presence of friction

• Variable mass

• Absence of friction

In the given example, what is the mass of each object?

• 5 kilograms

• 15 kilograms

• 20 kilograms

• 10 kilograms

What is the initial potential energy of each object in the example?

• 250 joules

• 500 joules

• 750 joules

• 1000 joules

What is the initial kinetic energy of the objects before they start moving?

• 1000 joules

• 500 joules

• 250 joules

• 0 joules

As the objects fall, what happens to their potential energy?

• It increases

• It decreases

• It remains constant

• It fluctuates

When the objects are halfway down, what is true about their energies?

• Total energy is zero

• Potential energy is zero

• Potential and kinetic energies are equal

• Kinetic energy is zero

What happens to the total mechanical energy as the objects move in a conservative system?

• It remains constant

• It doubles

• It is lost to the environment

• It is converted entirely to heat

What is the final kinetic energy of the objects when they reach the ground?

• 0 joules

• 1000 joules

• 250 joules

• 500 joules