CH 11.2: Energy & its Conservation

In a closed, isolated system, what might not be conserved during a collision?

• Total energy

• Kinetic energy

• Potential energy

• Thermal energy

What is mechanical energy, and when is it conserved?

• The sum of potential and kinetic energy; conserved in a closed system

• The energy of motion; conserved when energy is added

• The energy of position; conserved in an open system

• The sum of thermal and chemical energy; conserved in an isolated system

What is an inelastic collision?

• A collision where kinetic energy is conserved

• A collision where kinetic energy is lost

• A collision where objects do not touch

• A collision where objects gain energy

What does the law of conservation of energy state?

• Energy can be created and destroyed.

• Energy can neither be created nor destroyed.

• Energy is always increasing.

• Energy is always decreasing.

Which types of kinetic energy are included in mechanical energy?

• Translational and vibrational

• Rotational and vibrational

• Translational and rotational

• Rotational and electrical

What types of potential energy are included in mechanical energy?

• Gravitational and chemical

• Elastic and chemical

• Gravitational and elastic

• Elastic and thermal

In the equation ME = KE + PE, what does ME stand for?

• Maximum energy

• Mechanical energy

• Minimum energy

• Magnetic energy

What does the equation KE_i + PE_i = KE_f + PE_f represent?

• Conservation of mass

• Conservation of momentum

• Conservation of mechanical energy

• Conservation of charge

What does KE stand for in the context of mechanical energy?

• Kinetic energy

• Kinetic equilibrium

• Kinetic efficiency

• Kinetic elasticity

Which position on the pendulum diagram represents the point of maximum potential energy?

• A and E

• C

• B and D

• Only C