Very confused with physics. Please help?

Posted on 2016-03-04 18:54:00 in Physics by TAYLOR

We had a lab where we had a skater simulation and he skated on earth(medium gravity), moon(very little gravity) , and jupiter(a lot of gravity). Could you please help with the questions? 
1.what happens with kinetic 
and potential energy as the skater descends? 
I know kinetic energy increases and potential energy decreases but could you please explain why? 
2.what happens with kinetic and potential energy as the skater ascends? 
I known kinetic energy decrease and potential energy increase but could please explain why? 
3. Is there a difference in total enegery between earth,moon, and Jupiter? 
4. Is there difference in speed of skating between earth, moon, and Jupiter 
5. What will be the behavior of a skater of the track is in space(no gravity)?

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