Mechanical Energy Quiz

What does the law of conservation of mechanical energy state in a system such as a roller coaster where energy is transformed from potential to kinetic energy?

• Potential energy is always equal to kinetic energy

• Potential energy is always converted to kinetic energy

• There is always some energy lost as heat

• For any system, the total amount of mechanical energy remains the same

Why would a system, like a wind turbine, have less energy than it originally started with after generating electricity?

• The energy was lost as heat

• The energy was destroyed

• More energy was created at the beginning than at the end

• The temperature was too low to create heat

Which of the following best describes potential energy in a compressed spring used in an engineering project?

• Energy of motion

• Energy as heat

• Stored energy

• Energy that is doing work

What happens to the energy of a coconut that falls freely from a tree, demonstrating mechanical energy principles?

• Loses potential and gains kinetic energy

• Loses both potential and kinetic energy

• Gains potential and loses kinetic energy

• Gains both potential and kinetic energy

A wind-up toy that is fully wound and at rest possesses which type of energy based on the mechanics involved?

• Kinetic but no potential energy

• Potential but no kinetic energy

• Both potential and kinetic energy in equal amounts

• Neither PE nor KE

What type of energy does a motorcycle moving slowly at the top of a hill have in terms of both gravitational and mechanical energy?

• Entirely kinetic

• Entirely potential

• Entirely gravitational

• Both kinetic and potential

Which of the following statements is true regarding mechanical energy in the context of a hydraulic system used in engineering?

• The principle of conservation of mechanical energy states that the total mechanical energy in a system remains constant as long as only conservative forces act on it.

• Total energy is conserved for every system of particles on which there is external work done

• Some kinetic energy of an object will not be transformed into potential energy or other forms of energy

• Total energy is not conserved for every system of particles

The total mechanical energy of an object, such as a pendulum, at its highest point compared to its total mechanical energy at the lowest point is:

• Lesser

• Greater

• Equal

• Not related

What is mechanical energy, as applied in the context of an engineering machine, such as a hydraulic lift system?

• Mechanical energy is found in machinery only

• Mechanical energy is usually measured at the atomic level

• Mechanical energy is the sum of the chemical and thermal energy of an object

• Mechanical energy is the sum of the kinetic and potential energy of an object

Which of the following are the two types of mechanical energy, relevant in understanding the mechanics of a car engine system?

• Kinetic and Potential Energy

• Kinetic and Nuclear Energy

• Potential and Chemical Energy

• Thermal and Kinetic Energy