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# Where have I gone wrong?? [M1 Edexcel ] watch

1. (Original post by Adorable98)
So where should I include the alpha angle for the orange arrows?

Using the original diagram, you can split into components like this:

2. (Original post by notnek)
Your components should always be perpendicular. Your orange arrows are not but that may just be your drawing.

I recommend you draw your components like this:

Notice where I have put due to alternate/corresponding angles.
I see thank you !!
I've also been told that my diagram should've looked like this?
3. The particle is being pushed UP the slope so the term 30cos(36.8698...) should be positive. As friction acts in the opposite direction to the motion (i.e. down the slope) it should be negative.

Hence you should have 30cos(36.8...) - 2 x 9.8 x sin(36.8...) = 2a

This gives a=6.12
4. (Original post by Bicycle Girl)
The particle is being pushed UP the slope so the term 30cos(36.8698...) should be positive. As friction acts in the opposite direction to the motion (i.e. down the slope) it should be negative.

Hence you should have 30cos(36.8...) - 2 x 9.8 x sin(36.8...) = 2a

This gives a=6.12
in the mark scheme it says a = 2.75
5. Sorry, my mistake.

You can use one of the equations of motion. In particular s=ut + 0.5at(squared).

u=0, t=2, s=5.5

5.5 = 0x2 + 0.5 x a x 4
5.5 = 2a
a = 2.75

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