# Energy Test, need some extra revision

1. Aug 23, 2011

### BigMackey

1. The problem statement, all variables and given/known data
I have a test on Energy in a few days, I'm in the top science class at my school (grade 9).

2. Relevant equations
The test is on stuff like, Kinectic Energy, Potentional Energy, Renewable Energys etc.

If anyone on here can help me, It would be greatly appreciated.
If I left anything out that you may need please tell me & I'll try my best to answer.

2. Aug 23, 2011

### lewando

Test preparation is kinda out of scope for this forum. If you are working on a specific problem and are stuck, write it up!

3. Aug 23, 2011

### BigMackey

Cheers, would you happen to know of any websites where I could get some questions to revise on??

4. Aug 23, 2011

### lewando

5. Aug 23, 2011

### BigMackey

I do have one question that has me confused:
What is the force of an object with 10 joules of work & a mass of 10g?

6. Aug 23, 2011

### lewando

You are confused because it is a confusing question. Is it verbatim? If so, it is very badly-worded--you would do well to ignore it. If paraphrased or mis-translated, you would need to provide additional clarity. Also, when words fail, a diagram can be helpful.

7. Aug 23, 2011

### c03rcion

What distance has the object traversed? Is this horizontal or vertical translation? The question does not seem complete. I started working on this but you would need to know how far the object has traveled to find the acceleration unless the object has undergone vertical free fall where you can assume acceleration to be g.

W=Fd

F=ma

10g = 0.01kg

1/2mv2=KE
1/2mv2=10 J
v=[2(10)/0.01kg]1/2