# Physics terms

1. Apr 12, 2005

### joejo

hi its me again...

I just want to verify my work is correct so that my teacher wont claim its wrong...its a really simple matching activity...thanks in advance

Match following words with most appropriate description. Place the words for the term on the line beside the description.

Work, positive work, negative work, work-energy theorem, work-kinetic energy theorem, mechanical energy, kinetic energy, potential energy, gravitational potential energy, joule, conservative force, non-conservative force.

1. joule energy that is stored in by an object.

2. gravitational potential energy achieved by doing work against the force of gravity.

3. potential energy the transfer of mechanical energy.

4. kinetic energy the energy of motion.

5. mechanical energy combination of kinetic and potential energy.

6. work-kinetic energy theorem the special relationship between doing work on an object and
the resulting kinetic energy of the object.
7. negative work removes energy from an object.

8. positive work adds energy to an object.

9. conservative force when a force does work on an object and the amount of work
done is independent of the path taken.

10. non-conservative force when a force does work on an object and the amount of work
done is path-dependent.

2. Apr 12, 2005

### FredGarvin

Here's my two cents worth.

#1: A joule is a unit of energy. It does not necessarily need to be stored by the object. It can be an amount of energy required to do something, or an amount of energy created, etc...

#3: Your definition of Potential Energy needs work. Potential energy is a form of energy due solely to position or arrangement. It is not a transfer of energy.

#7: You may want to add that the net force doing the work is in the opposite direction as the displacement.

#8: You may want to add that the net force doing the work is in the same direction as the displacement.

3. Apr 12, 2005

### joejo

im lost...i found those were the best ones that fit according to the choice of words we had above....my teachers defintions weren't clear so its hard to match...can someone tell where i went wrong and if so wat is the correct answer

4. Apr 12, 2005

### BobG

I'm lost, too, by which definition would best fit joule, which, as FredGarvin said, is a unit of measure.

Best among the definitions available for potential energy would be "energy that is stored in by an object".

That only leaves one choice for joule.

5. Apr 12, 2005

### joejo

so what i have so far...does it look right?

6. Apr 12, 2005

### whozum

1. Joule - unit of energy equal to applying a force of 1N across 1m.
2. GPE - potential energy attained from being in a gravitational field
3. PE - energy attained by being in a certain position or state
5. ME - total amt of energy an object has.

7. Apr 12, 2005

### FredGarvin

Whoops. Sorry. I didn't read the entire original post. I suppose that would help, wouldn't it? My bad.

8. Apr 12, 2005

### Gokul43201

Staff Emeritus
I would swap 1 and 3. I wouldn't be very happy about it, but I'd do it nevertheless.

9. Apr 12, 2005

### joejo

you guys are totally losing me! can someone please tell me what's wrong and what's right!! thanks

10. Apr 12, 2005

### UrbanXrisis

everything is right BUT just switch 1 and 3

11. Apr 12, 2005

### joejo

ohh okay thanks!

12. Apr 12, 2005

### joejo

how can joules be...the transfer of mechanical energy.

13. Apr 12, 2005

### whozum

It isnt, joules is a unit of energy, but none of your definitions match this.

14. Apr 13, 2005

### joejo

i know they dont...thats not the question tho...which one best matches them...there are more words above...check it out please

15. Apr 13, 2005

### Gokul43201

Staff Emeritus
how can potential energy be...the transfer of mechanical energy ?

16. Apr 13, 2005

### joejo

well it cant...but it cant be joule either theres a few more terms above....do they match...

17. Apr 13, 2005

### whozum

Most the other terms fit their descriptor. Those two definitions arent accurate for either joule or potential energy.

18. Apr 13, 2005

### rainbowings

i think you had best go with your original list - 1 and 3 are both unsatisfactory, but swapping them makes them more so.