Energy
What units are each of the following measured in?  (For example, velocity is typically measured in meters per second or “m/s”).

Work:

Kinetic Energy:

Force:

Power:

Potential Energy:

Acceleration:

Time (when dealing with power): Velocity (when dealing with KE):

Mass (when dealing with KE, PE, F, etc.):Height (when dealing with PE):
 

Concept questions:
(Answer four of the six; if you answer more, only the first four will be graded):

Give a specific example of potential energy involving a small mass and a large height.
 
 

Give a specific example of potential energy involving a large mass and a short height.
 
 

Give a specific example of potential energy involving a large mass and a large height.
 
 

Give a specific example of kinetic energy involving a small mass and a large velocity.
 
 

Give a specific example of kinetic energy involving a large mass and a small velocity.
 
 

Give a specific example of kinetic energy involving a large mass and a large velocity.
 
 
 
 
 

Word problems:
(Answer four of the five; if you answer more, only the first four will be graded):

What is the gravitational PE of a 850 kg roller coaster car at the top of a 45 m high part of the track?
 
 

How much mass does a rock with 75 J of potential energy have if it is 12 m above the ground?
 
 

What is the kinetic energy of a 3500 kg meteor falling at 7000 m/s?
 
 

How fast is a 2.5 kg baseball traveling for it to have 750 Joules of kinetic energy?
 
 

If a 75 N crate theoretically requires 750 J of work to move it across 10 m, What is the efficiency of this system?
 
 

Forms of energy:
Tell which type of energy (e.g., mechanical, chemical, nuclear, or electromagnetic) each of the following is an example of:
(Answer six of the eight; if you answer more, only the first four will be graded):

_________________   Sunlight

_________________   Plants using sunlight to make sugars

_________________   Dropping an atomic bomb on Hiroshima

_________________   Windmills grinding flour

_________________   Sliding down a water slide

_________________   Uranium rods fueling a power plant

_________________   The sun fusing hydrogen into helium

_________________   Lightning

More concept questions:
(Answer four of the five; if you answer more, only the first four will be graded):

Give an example of kinetic energy being converted to potential energy.
 
 
 

Give an example of potential energy being converted to kinetic energy.
 
 
 

Why is it impossible to have a closed system?
 
 
 

What happens to the extra energy that is “lost” when a machine is running at less than 100% efficiency (which is true of all machines)?  In other words, give specific examples of what the “missing” energy is converted into.
 
 
 

Why is it impossible to build a perpetual motion machine?
 
 
 


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