Work, Energy,& Power #2: Energy
Define: kinetic energy -

 

Give the equation for kinetic energy.
 
 

Identify the variables in the equation and give the units of each.
 
 

State the “work-kinetic energy theorem.”
 
 

Use the work-kinetic energy theorem to explain the following where the energy came from:
In a bobsled?
 
 

In an arrow from Robin Hood’s bow?
 
 

In a sky diver falling toward earth?
 
 
 

Two football player run at the same speed. One has a mass of 80 kg the other 120 kg. Which has the greater kinetic energy?  How could the other player get the same energy?
 

Define: potential energy -
 
 

Define: gravitational potential energy -
 
 

Give the equation for gravitational potential energy.
 
 

Identify the variables in the equation and give the units of each.
 

Two elephants climb up into a tree. The first elephant is afraid of heights and only climbs 3 meters high. The second is a daredevil and limbs up 12 meters. Which has the greatest potential energy? What is the ratio of their energy?
 
 

Define: elastic potential energy -
 
 

Define: spring constant -
 

Give the equation for elastic potential energy.
 
 

Identify the variables in the equation and give the units of each.
 
 

A spring with a force constant of 5.2 N/m has a related length of 2.45 m.  When a mass is attached to the end of the spring and allowed to come to rest, the vertical length of the spring is 3.57 m.  Calculate the elastic potential energy stored in the spring.
 
 
 


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