Name:______Period:

(First) (Last)

Energy Quiz 4

1.  Match the term with the correct definition:

___Sound Energy a. The vibration of electrically charged particles

___ Work b. The random motion of particles in an object

___ Thermal Energy c. The vibration of air particles

___ Energy d. The combination of potential and kinetic energy

___ Light Energy e. A force the causes an object to move in the direction of the force

___ Mechanical Energy f. The ability to do work

___ Nuclear Energy g. The energy stored in the nucleus of an atom

___ Chemical Energy h. The energy of moving electrons

___ Electrical Energy i. The energy stored in the bonds of molecules

2.  Calculate the total amount of energy in each situation:

  1. A 23kg emperor penguin swimming at 9.8 m/s
  1. A 10kg dictionary sitting on a shelf that is 6.5m high.
  1. A 2.3kg black seagull flying at 5.5 m/s, that is 45m up in the sky.

3.  Jerome is conducting an experiment in which he inputs 80 joules of chemical energy into a robot he has built. He calculates the light, sound and mechanical energy the robot uses and finds it to be 100 joules. His friend says he must have made a mistake in his calculations, but Jerome doesn’t understand why. Explain how is his friend knew Jerome’s calculations were off.

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4.  What energy conversions take place in the following objects?

  1. A toaster:
  1. Dog food being eaten by a dog:
  1. A CD player playing your favorite CD:

5.  Megan conducted an experiment where she mixed two reactants. The starting temperature of the reactants was 26⁰C. After she mixed her reactants, they had an ending temperature of 12⁰C. Was this experiment endothermic or exothermic? What does that tell you about the energy change in the reactants?

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