Phys-Presentation 4.3 Conservation of Energy

What principle explains the energy transformation in a rocket launch?

• Conservation of Mass

• Conservation of Energy

• Conservation of Momentum

• Conservation of Charge

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In a rocket launch, the chemical energy in the fuel is converted into ________ energy.

• Kinetic

• Thermal

• Potential

• Electrical

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Which of the following statements is true about energy in a closed system?

• A) Energy can be created or destroyed.

• B) Energy is always increasing.

• C) The total energy is conserved.

• D) Energy cannot be transferred.

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Energy can be _______ between systems.

• destroyed

• transferred

• ignored

• isolated

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What does the law of conservation of energy state?

• A) Energy can be created and destroyed

• B) Energy is neither created nor destroyed

• C) Energy is only created

• D) Energy is only destroyed.

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In the equation E_i + W = E_f, what does E_i represent?

• Final energy

• Initial energy

• Work done

• Total energy

What is the formula for the total energy of a system?

• E_total = KE + PE_g + PE_s + U_int

• E_total = KE + PE_g + U_int

• E_total = KE + PE_s + U_int

• E_total = PE_g + PE_s + U_int

Fill in the blank: The total energy of a system is equal to the kinetic energy plus the gravitational potential energy plus the elastic potential energy plus the ________.

• external energy

• internal energy

• thermal energy

• chemical energy

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What does the Work-Energy Theorem state?

• The total work done on a system equals the change in kinetic energy.

• The total work done on a system equals the change in potential energy.

• The total work done on a system equals the sum of kinetic and potential energy.

• The total work done on a system equals the initial kinetic energy.

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Fill in the blank: The Expanded Work-Energy Theorem states that the initial kinetic energy plus initial gravitational potential energy plus the initial elastic potential energy of a system, plus the work done on the system, equals the _______ kinetic energy and potential energies of the system.

• initial

• final

• average

• total