PS Ch. 13.4 Conservation of Energy

Multiple Choice

As a dropped penny falls toward the ground, _____________ energy is

converted to ___________ energy.

• thermal, potential

• kinetic, vibrational

• kinetic, heat

• potential, kinetic

Multiple Choice

At the top of its arc, a thrown ball has ____________ potential energy.

• maximum

• minimum

• zero

• average

Multiple Choice

A dropped racquetball will not return to its original position because

• potential energy is inefficient

• the mechanical energy is stored up for later bounces.

• some of the mechanical energy is converted to nonmechanical energy

• energy is not conserved.

Multiple Choice

The law of conservation of energy states that energy

• is created from motion.

• cannot be created or destroyed.

• is always equal and opposite.

• can only be converted into heat

Multiple Choice

Mechanical energy can change to nonmechanical energy as a result of

• air resistance

• heat.

• radiation

• None of the above

Multiple Choice

____________ is the ratio of useful work output to work input.

• Potential energy

• Efficiency

• Kinetic energy

• Power

Multiple Choice

A system that receives energy from external sources is called

• open

• closed

• compound

• efficient