Calculating Work Done

  • Thread starter 01010011
  • Start date
  • #1
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Homework Statement


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?


Homework Equations


Work = force * distance



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
 

Answers and Replies

  • #2
172
1
Work, force, and displacement are vectors. Can you figure out "why" from there?
 
  • #3
cronxeh
Gold Member
961
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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
48
0
Work, force, and displacement are vectors. Can you figure out "why" from there?
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?

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..
Thanks very much, you made it clearer
 

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