- #1

nav888

- 38

- 2

- Homework Statement
- Writing a conservation of energy statement

- Relevant Equations
- W = mgh

E = 1/2 mv^2

So, I cannot for the life of me write a conservation of energy statement, when an object is lifted up by a force. So in my example there is a box on the floor with v = 0, and then a force of magnitude F, where F > mg, acts on the ball, now the net force is F-mg, and hence the work done is (F - mg) h where h is the vertical height, Now I thought that the work done is equal to the energy of the ball, and hence (F - mg) h = 1/2mv^2 + mgh.

But this isnt correct, could someone please help explain?

Many thanks

But this isnt correct, could someone please help explain?

Many thanks