relationship of energy and work work = force x displacement suppose i went to office and came back so my displacement will be zero , does that mean i have done no work at all despite the loss of energy i have incurred?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Work is force times distance. A force is applied on an object over a distance. It must be displaced for work to be done. Therefore, standing in the same spot holding a box, without moving means no work is done on that body. However, if you carry that box from point A to point B, work is done in Joules.

Approved by eNotes Editorial Team
An illustration of the letter 'A' in a speech bubbles

First of all.

Work is defined as the scalar product of force and displacement.

W = F.s

Therefore it is a scalar, it is not a vector. So you just add them up and you dont take a sign into account.

Therefore total work you done = Work from home to office+ work from office to home.

They add up, they dont cancel out.

Energy is also the same. It is a scalar too, not a vector.

Approved by eNotes Editorial Team

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial