Increase in speed, increase in energy

  • Thread starter MechaMZ
  • Start date
  • #1
128
0

Homework Statement


an 5kg object speed up from 5m/s(point A) to 10m/s(point B)

at point A, the energy is 0.5mv2 = 0.5(5)(5)2 = 62.5J
at point B, the energy is 0.5mv2 = 0.5(5)(10)2 = 250J

I don't not sure why the energy in the object is increased when it speeds up from point A to point B. suppose the energy in the object should be taken up to increase it's speed isn't?

or my concept is wrong?
 

Answers and Replies

  • #2
Delphi51
Homework Helper
3,407
10
You have calculated the kinetic energy, the energy due to speed. The greater the speed, the greater the kinetic energy.

In a real situation some other type of energy would have to decrease to free up the energy needed to increase the speed.
 

Related Threads on Increase in speed, increase in energy

  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
3
Views
533
Replies
1
Views
468
  • Last Post
Replies
2
Views
6K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
4
Views
9K
Replies
4
Views
1K
  • Last Post
Replies
1
Views
2K
Top