Mechanics DOUBT: WORK,ENERGY,POWER

When using the energy method to write an equation and find something, how do we decide on which side of the equation must loss/gain in kinetic/potential energy be written...hope this makes sense...coz everytime i get the final answer incorrect , due to writing them in the wrong side of the equation. for example; when gain in kinetic energy must be substracted from work done, i would have added it and this results in getting the final answer incorrect :frown:

(edited 10 months ago)

Reply 1

Mocha Latte

Original post by Marysa.15

When using the energy method to write an equation and find something, how do we decide on which side of the equation must loss/gain in kinetic/potential energy be written...hope this makes sense

initial KE + final PE - energy lost (e.g. work done by friction against the motion) + energy added (e.g. work done by the driving force) = final KE + final PE

Reply 2

Marysa.15

Original post by Mocha Latte

initial KE + final PE - energy lost (e.g. work done by friction against the motion) + energy added (e.g. work done by the driving force) = final KE + final PE

why is final PE added in both sides???