Formula involving the change in a kinetic energy

  • #1
I'm looking for a formula involving the change in a kinetic energy, I have a 120 N force applied at an angle of 30 degrees above the horizontal to a 4kg box. The box moves a horizontal distance of 8 meters. The change in the kinetic energy of the box is:

Just looking for a formula to figure this one out
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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The work done by the force on the box=Change in kinetic energy of the box.
 
  • #3
3
0
Hi,...What equations do you have for work? Calculate the vector components of the 120N force. This will simplify the problem for you.
 

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  • #4
Pengwuino
Gold Member
5,009
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If you assume the initial velocity is 0, you know that the final energy of the box is E = K + V, K being the kinetic energy and V being the potential. If gravity is involved, your potential V is mgh. If not, it's 0. You also know that your total energy, or the work done to the box, is equal to [tex]F \cdot d\overrightarrow x [/tex]. Break down the force into its components to determine the work done.
 
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