# Force on a lifted object

1. Nov 28, 2009

### yyttr2

Is the force done on a lifted object equal the weight of the object in newtons times the height lifted?
F=mgh?
I would have used this but I noticed it was the same equation for gravitational potential energy (or just potential energy)...So I thought I would ask you all after failing to find it online.

2. Nov 28, 2009

### Staff: Mentor

I suspect you meant work instead of force.
Yes, the work you must do to lift an object equals the increase in gravitational potential energy.

3. Nov 28, 2009

### yyttr2

no, no I was talking about force. I am trying to find the change in gravitational potential energy from a 2.0 object being lifted 3.5 meters.
So I thought I would find Ke at the bottom.

$$\sum w=\Delta ke$$

W=F.d

So I want to know if F=mgh
:)

If I am completely full of crap and doing it wrong please tell me

4. Nov 28, 2009

### Staff: Mentor

No, F = mg (the weight). (Assuming you are doing the minimum work to overcome gravity.)

So W = Fd = mgh.

5. Nov 28, 2009

### yyttr2

oh, duh xD I feel stupid now. thank you.