Energy - Capacity to do work

 

I)                Work - when a ___________ causes an object to __________

         in the direction of that force.

 

                                *** ______________ - means direction doesn't count

 

A) Equation           W =  ________     Fm - force acting in same direct as motion

          (Nm) (N)(m)   d - displacement

 

       

Other units for work (______________) or   Kg m2
      sec2

                      

Challenge Question: Two people exert a 10 Newton force on a block for 2 meters.  One person exerts her force at a 50-degree angle.

 

Did both people do the same work???

 

 

B)     Work and F vs. displacement diagram

 

 

____________ under a Force vs. displacement plot is equal to ________

 


II.     Energy (Joules) - 2 kinds

       

A)               Potential Energy - ________________ energy that an object has

due to its ________________ or ________________

 

1.                  ________________ P.E. g (PE is an abbreviation for Potential Energy)

                       

                                Not in reference

 

 

                        P.E. g  = ________________     g - on earth = 9.8 m/s2

                            

       units     

                              

        

                        mg = ________________________________

                       

h = ________________ - distance force could be exerted

 

 DP.E. = ________________

       

Ex) What P.E. is gained when a 100 kg object when it is raised 4m straight

      up?

 

 

 

What PE would be gain if the object were moved 4m to the right?