Physics Van 3-site Navigational Menu

Physics Van Navigational Menu

Q & A: moon work

Learn more physics!

Most recent answer: 10/22/2007
Q:
Hi I would like to clear something up with someone at work.
I lift a 100lb barbell over my head on earth an that I use x joules of energy in my muscles to do so.
If I took that same barbell to the moon and lifted it over my head would I use x or less than x joules of energy?
- Kon
Melbourne, Australia
A:
Less.  The force of gravity on the moon is less than that of earth. The amount of energy
required is directly proportional to the force of gravity times the distance lifted.
LeeH

(published on 10/22/2007)

Follow-up on this answer.