Mechanical Energy Conservation Quiz

What happens to the total mechanical energy of a system when non-conservative forces do work on it?

• It decreases.

• It remains constant.

• It changes.

• It increases.

Under what condition is the total mechanical energy of a system conserved?

• When only non-conservative forces do work.

• When no forces do work.

• When only conservative forces do work.

• When external forces do work.

In the example of a projectile, what happens to the kinetic energy at the peak of its trajectory?

• It is zero.

• It is at its minimum.

• It is equal to potential energy.

• It is at its maximum.

How does a pendulum demonstrate mechanical energy conservation?

• By losing energy to air resistance.

• By converting potential energy to kinetic energy and vice versa.

• By maintaining constant kinetic energy.

• By converting potential energy to thermal energy.

What role does the tension force play in the motion of a pendulum?

• It acts perpendicular to the motion, doing no work.

• It increases the pendulum's speed.

• It does work on the pendulum.

• It changes the pendulum's energy.

In a roller coaster, when is the kinetic energy the greatest?

• At the highest point.

• At the lowest point.

• At the start.

• At the midpoint.

Why does the normal force not do work on a roller coaster car?

• It is weaker than gravity.

• It acts perpendicular to the direction of motion.

• It acts parallel to the track.

• It is a conservative force.

What happens to a ski jumper's potential energy as they descend?

• It converts to thermal energy.

• It decreases.

• It remains constant.

• It increases.

How do non-conservative forces like air resistance affect mechanical energy?

• They only affect potential energy.

• They have no effect on mechanical energy.

• They convert mechanical energy to non-mechanical forms.

• They increase mechanical energy.

What is an example of a non-mechanical form of energy that mechanical energy can be converted into?

• Thermal energy

• Kinetic energy

• Potential energy

• Gravitational energy