# Plane inclined mechanics physics problem

1. Feb 24, 2005

### Gughanath

I have a problem with a question. The problem si that I cant understand the question.
We got a mass, which rests on a plane inclined at 20 degrees to the horizontal. There is a force Y which is at 45 degress to the horizontal, which acts on the mass. I dont know which way to draw the force Y, do I measure the ange from left to right?, or the other way round?

2. Feb 24, 2005

### dextercioby

Is it relevant...?

Daniel.

3. Feb 24, 2005

### Gughanath

What do you mean??

4. Feb 24, 2005

### danne89

He wonder if you are supposed to use Einstein's thoery of reativity.

5. Feb 24, 2005

### dextercioby

The idea is nice,too bad the wording's not that pretty... :tongue:

Daniel.

P.S.One point for spelling EINSTEIN right,though... :tongue2:

6. Feb 27, 2005

### Gughanath

You guys are really funny..HAHAHA

7. Feb 27, 2005

### HallsofIvy

"left or right" is not relevant since either way would give the same answer.

"up or down" is important! I would assume that the "20 degrees from the horizontal" for the slope means that the bottom end goes 20 degrees UP and so, from the top end, goes 20 degrees DOWN. However, it seems to me that you will need to be told whether that 45 degrees the force makes with the horizontal is upward or downward.