# Calculating Work Done

1. Apr 21, 2010

### 01010011

1. The problem statement, all variables and given/known data
A box of weight 100N is pushed a distance or displacement of 2m with a force of 40N. What is the work done on the box by i) the weight and ii) by the 40N force?

2. Relevant equations
Work = force * distance

3. The attempt at a solution
i) The work done on the box by weight = 0 (if this is correct, why?)

ii) The work done on the box by the 40N force
Work = force * distance
Work = 40 * 2
Work = 80N

2. Apr 21, 2010

### Jack21222

Work, force, and displacement are vectors. Can you figure out "why" from there?

3. Apr 21, 2010

### cronxeh

I'll just say ths, work done by weight is 0 because that fat box did not helping you out AT ALL :grumpy:

Now, if it was on an incline sliding down as you pushed it..

4. Apr 21, 2010

### 01010011

Let me see... weight is acting vertically downwards, while force and displacement are acting horizontally. Therefore the weight had no influence on the force and displacement?

Thanks very much, you made it clearer